The South Shore Line (reporting mark NICD) is an electrically powered interurban commuter rail line operated by the Northern Indiana Commuter Transportation District (NICTD) between Millennium Station in downtown Chicago, Illinois and the South Bend International Airport in South Bend, Indiana, United States. The name refers to both the physical line and the service operated over that route. The line was built in 1901–1908 by predecessors of the Chicago South Shore and South Bend Railroad, which continues to operate freight service. Passenger operation was assumed by the NICTD in 1989, who also purchased the track in 1990. The South Shore Line is one of the last surviving interurban trains in the United States. In 2023, the system had a ridership of 1,406,900, or about 5,400 per weekday as of the second quarter of 2024.

Departing South Bend Airport, the South Shore Line heads south alongside Bendix Drive, then west along Westmoor Street, before connecting with the tracks that ran to its former terminus. Between that point and Hudson Lake, Indiana, the South Shore Line runs parallel to Norfolk Southern's Chicago Rail Line, also used by Amtrak's Lake Shore Limited and Capitol Limited, on the north side of the tracks. Just before Hudson Lake, the line crosses from St. Joseph County into LaPorte County and enters the Central Time Zone.

From Hudson Lake, the South Shore continues straight west to Michigan City. In Michigan City, the track runs parallel to 11th Street from Michigan Boulevard to Tennessee Street, where it crosses over to Tenth Street. There, the railroad has an at-grade diamond with Amtrak's Michigan Services, after which it runs until Sheridan Avenue on the west side of Michigan City, Leaving Michigan City, the track travels through Indiana Dunes State Park, crosses over the Chicago Line and runs parallel to it, this time on the south side, past Long Lake. At Gary, Indiana, the route heads west to service the Gary Airport, at times running parallel to the Indiana Toll Road, as far as Hammond, Indiana. Just west of Hammond Gateway station, the route crosses into Illinois and Chicago city limits, at which point the track curves northwest, through the Hegewisch neighborhood and, after crossing the Bishop Ford Freeway and the Calumet River, converges with the Metra Electric line south of Kensington/115th Street station. The South Shore Line then runs over the Metra Electric from Kensington/115th Street the rest of the way to Millennium Station.

The line is quadruple tracked along the section shared with the Metra Electric line from Millennium Station to Kensington/115th Street, double-tracked from Kensington/115th Street to the yard at Michigan City, and single-tracked from there to South Bend Airport.

The most recent service update was on August 20, 2024, when NICTD published an updated schedule incorporating passenger feedback regarding new double-track service.

In the westbound direction, 26 trains terminate at Millennium Station. Six of these trips run the whole length of the line from South Bend Airport, while all other trips originate at other stops in Michigan City and Gary (8 trains from Carroll Avenue, 5 trains from 11th Street, and 7 trains from Miller). Some trips are "express" and do not make certain station stops; while mainly concentrated in the morning peak, some trips in the afternoon are also express.

In the eastbound direction, 27 trains originate at Millennium Station. Six trains continue all the way to South Bend Airport, while 6 trains terminate at Miller and the remainder terminate at either Carroll Avenue or 11th Street.

In addition to service at Millennium Station, there are three trains that run only between Carroll Avenue and South Bend Airport, with eastbound service in the early morning and westbound service in the late evening.

On weekends and holidays, there are nine trains to and from Millennium Station. In the westbound direction, four trains originate at Carroll Avenue while all others originate at South Bend Airport; however, in the eastbound direction, all but three trains terminate at South Bend Airport.

Additionally, three shuttle trains run between Carroll Avenue and South Bend Airport in the westbound direction, but only two trains are scheduled for eastbound service.

The South Shore Line was constructed between 1901 and 1908 by the Chicago and Indiana Air Line Railway (reorganized as the Chicago, Lake Shore and South Bend Railway [CLS&SB] in 1904). Revenue service between Michigan City and South Bend began on July 1, 1908. The CLS&SB leased the Kensington and Eastern Railroad on April 4, 1909, giving it access to Chicago. That year the full line to Kensington on the Illinois Central was completed, and beginning on June 2, 1912, the electric cars were coupled to IC steam locomotives and run to downtown Chicago.

The Chicago, Lake Shore and South Bend entered bankruptcy in 1925 and was bought by Samuel Insull's Chicago South Shore and South Bend Railroad (CSS&SB). The line continued to handle both freight and passengers. Under Insull, the CSS&SB embarked on a major rehabilitation program. This included new ballast and ties, 100-pound (45 kg) rail in place of 70-pound (32 kg) rail, brush clearance, and an overhaul of the line's block signals. In 1949, the company acquired three Little Joe electric locomotives for freight service. These locomotives had originally been constructed for the Soviet Union, but changing attitudes due to the Cold War prevented them from being delivered. Although the exact same type as the Milwaukee Joes, the South Shore bought them before the Milwaukee did. These locomotives continued in freight service on the CSS&SB until 1983. No. 803, is preserved in operating condition at the Illinois Railway Museum.

The power system was changed from 6600 volts AC to 1500 volts DC on July 28, 1926, allowing trains to operate directly to the Illinois Central Railroad's Randolph Street Terminal (now Millennium Station) without an engine change. Trains began running to Randolph Street on August 29. That same year, the original line between East Chicago and Indiana Harbor was abandoned.

The Chicago South Shore and South Bend turned a profit during World War II due to the industrial nature of Northern Indiana. However, highway competition and suburban growth led to ridership declines. By the 1950s all interurban lines were seeing a decline in rail travel as automobile use increased. On September 16, 1956, a street running section in East Chicago was removed with the building of a new alignment alongside the Indiana Toll Road. A truncation to west of downtown South Bend removed street trackage in that city from July 1, 1970.

The Chesapeake and Ohio Railway acquired the CSS&SB on January 3, 1967 and continued the operation of passenger services. The Chicago South Shore and South Bend was one of six railroads with long-distance passenger services to decline joining Amtrak in 1971 and in 1976, they asked the Interstate Commerce Commission (ICC) to abandon passenger service. The ICC gave the state of Indiana a chance to reply and subsequently, the Northern Indiana Commuter Transportation District (NICTD) was formed in 1977 to subsidize service.

In the late 1980s, the Chicago South Shore and South Bend went bankrupt and on December 29, 1989, passenger service was assumed by NICTD. In December 1990, the track was sold to NICTD and freight service was taken over by the new Chicago South Shore and South Bend Railroad, a subsidiary of short line operator Anacostia & Pacific. On November 21, 1992, the line's South Bend terminus moved from the Amtrak station to the airport. On July 5, 1994, NICTD closed the Ambridge, Kemil Road, Willard Avenue, LaLumiere, Rolling Prairie, and New Carlisle flag stops. A seventh station, Dune Acres, closed around the same time once parking was expanded at nearby Dune Park.

The railroad began a 3-year project in 2009 to replace all catenary on its line between Michigan City and Gary, some of which was nearly 90 years old. The project cost $18 million and caused service disruptions on weekends while new wires were strung.

The Chicago Region Environmental and Transportation Efficiency Program (CREATE), replaced a bridge on the South Shore Line across 130th Street, Torrence Avenue, and Norfolk Southern tracks in the Hegewisch neighborhood of Chicago as a part of a four-year project lasting from 2011 to 2015. The 2,350 ton bridge would be put in place in August 2012.

In 2015 NICTD began an express service between South Bend and Chicago. Targeted at business travelers, the train makes just two intermediate stops: Dune Park and East Chicago. The total scheduled travel time is 1 hour 55 minutes, more than thirty minutes faster than existing services.

In July 2020 during the COVID-19 pandemic, NICTD implemented "mask optional cars" for riders choosing not to wear masks, as Indiana did not have a statewide mask mandate. This received a controversial reception at the time, as it was alleged at the time to not help slow down the spread of the coronavirus disease, and the "mask optional" car was also the only car with bike racks. On November 14, 2020, the "mask optional cars" were discontinued, requiring all passengers to wear a mask.

South Shore Line
In service	1982–present
Manufacturer	Nippon Sharyo
Constructed	1982–1983, 1992, 2001
Number built	68
Formation	Married-pair
Fleet numbers	1–48, 201–210, 101–110
Capacity	93
Operators	CSS&SB, NICTD
Lines served	South Shore Line
Specifications
Car body construction	stainless steel
Car length	85 ft (25.91 m)
Width	10 ft 6 in (3.20 m)
Height	15 ft 11 in (4.85 m)
Wheel diameter	36 in (914 mm)
Wheelbase	8 ft 2+1⁄2 in (2.502 m)
Maximum speed	79 mph (127 km/h)
Weight	118,000 lb (54,000 kg) (empty)
Traction system	IGBT-VVVF (Toshiba)
Traction motors	3-phase AC induction motor (Toshiba)
HVAC	Electric heating, Air conditioning
Electric system(s)	Overhead line, 1,500 V DC
Current collector(s)	Pantograph
UIC classification	Bo’Bo’+Bo’Bo’
AAR wheel arrangement	B-B+B-B
Bogies	ND-312
Coupling system	Tomlinson
Track gauge	4 ft 8+1⁄2 in (1,435 mm) standard gauge

The South Shore Line operates with a fleet of 82 rail cars built between 1982 and 2009 by Nippon Sharyo. The fleet consists of 58 single-level self-propelled cars, 10 single-level unpowered trailers, and 14 bilevel self-propelled cars. The single level fleet's design shares commonalities with MARC's locomotive-hauled MARC II fleet, which were also built by Nippon Sharyo. An additional 26 cars are planned to be acquired, replacing those to be transferred to West Lake Corridor services. Several Highliner 2s from Metra Electric have already been acquired.

Numbers	Model	Built	Builder	notes
1–48	Single-level electric multiple unit	1982–83, 1992	Nippon Sharyo
201–210	Trailer	1992
101–110	Single-level electric multiple unit	2001
301–314	Highliner II	2009
1201–1226	Highliner II	2005–2006		Ex Metra Electric

Pullman and the Standard Steel Car Company delivered electric multiple units to the CSS&SB between 1926 and 1929. Many were lengthened in the 1940s and 1950s.

Numbers	Model	Built	Builder	Notes
1–11	62-seat coach	1908	Niles	Two cars scrapped prior to 1923; the remainder scrapped in 1929
12–15				Built as trailers. Rebuilt in 1915 with motors. Baggage compartments added in 1925. Scrapped in summer of 1929.
60–61	48-seat suburban car		Kuhlman	60 wrecked prior to 1918. 61 scrapped in 1927
62–63		1903	Brill	Originally Chicago and Indiana Air Line Railway cars 1 and 2
64		1918	Kuhlman	Built as a replacement for car 60
70–71	54-seat coach	1908	Niles	71 rebuilt as CSS&SB 401 in 1927. 70 used as a yard office and scrapped in 1935.
72–74	46-seat combine			Rebuilt with larger baggage compartments. 73 wrecked in 1909 and rebuilt to work motor 1126 in 1927; undergoing restoration. 72 rebuilt to line car 1101 in 1927. 74 used as trainmen's room at South Bend and scrapped in 1941.
75–77	54-seat coach			Scrapped in summer of 1929
101–110	52-seat coach		Kuhlman	Two cars rebuilt into CSS&SB 222 and 224 in 1927. The remainder were scrapped in 1929.
111–112	60-seat open vestibule car	[data missing]	[data missing]	Purchased in 1917. Formerly AT&SF cars.
113–114	56-seat open vestibule car	[data missing]	[data missing]
1–10	56-seat coach smoker	1926	Pullman
11–15	80-seat coach			Lengthened in 1942–46
16–25		1927		Lengthened in 1945–47
26–29		1929	Standard Steel	Lengthened in 1948
30–37; 39	48-seat coach smoker
38	56-seat coach
40	48-seat coach smoker	1938		Rebuilt from trailer no. 213
100–109	64–68 seat coach–baggage	1926	Pullman	Lengthened in 1943–44 and modernized in 1949–50
110–111	64-seat coach–baggage	1951	Standard Steel	Rebuilt from coaches nos. 10 and 29
201–206	80-seat coach trailer	1927	Pullman	Lengthened in 1946–48
207–210	50-seat coach smoker trailer
211–212		1929
351–352	16-seat parlor–observation–buffet trailer	1927		Originally 20 fixed chairs; rebuilt with 16 rotating chairs in 1929; rebuilt as coaches in 1942
353–354	56-seat coach trailer	1938–39	Standard Steel	Rebuilt from parlors built in 1929

The South Shore Line uses a zone-based fare system, with prices based on the distance traveled and stations' proximity to Millennium Station. There are a total of eleven zones (1–11). Tickets may be purchased at stations, online, and through the South Shore mobile app. Ticket options include one-way, 10-ride, 25-ride, and monthly passes. One-way tickets may also be purchased on trains, but will incur a $1.00 penalty fee if a ticket agent was present at the departure station. Children aged 13 years and under, seniors aged 65 and over, passengers with disabilities, students, active-duty military personnel, and those holding RTA Reduced Fare Permits are eligible for reduced fares. NICTD accepts cash aboard trains, cash and checks at ticket offices, and credit cards online and at Millennium Station's ticket office. Most stations have ticket machines which only accept credit cards. For travel to Hegewisch station (zone 3), fares are set by Metra.

Since 2005, there has been an ongoing debate pertaining to plans to relocate trackage off the streets of Michigan City. In July 2009, NICTD announced its intention to relocate the Michigan City track south of its current location in order to smooth out the curves, cut down the number of grade crossings, increase speed and reduce maintenance costs. The plan also calls for the replacement of both current stations with a single new station located a block west of the current 11th Street boarding location (between Franklin and Washington streets) with a modern, high-level platform and parking lot. The plan would require a demolition of residential and retail buildings currently located on the south side of 11th Street.

The relocation effort faced a setback in March 2010 when NICTD announced that it was short necessary funds to complete the preliminary engineering study. Unless the funding was found, the relocation would have been postponed indefinitely since, without the engineering study, NICTD would not be able to get state and federal funds necessary to complete the relocation. NICTD and the city continued to work on obtaining the funds needed. In 2011 NICTD accepted bids for a $1 million study, expected to take 18 months. The study was completed in October 2013. The preferred alternative identified by the study preserved an alignment similar to the current route but relocated the tracks alongside the street. It proposed replacing the two existing stations with a new station near the center of Michigan City. The realignment was completed as a part of the double track project from Gary to Michigan City.

Street running ended on February 27, 2022, and buses replaced trains within this section prior to the opening of the new alignment. Service between Dune Park and Carroll Avenue resumed on October 25, 2023. Service on the remaining closed section between Gary and Dune Park restarted on April 9, 2024, with a new schedule taking advantage of the double track beginning on May 14.

Monon Corridor
Legend
0 mi Millennium Station 0.8 mi 1.3 km Van Buren Street 1.4 mi 2.3 km Museum Campus/11th Street IC West Line to Addison Amtrak to Union Station 2.7 mi 4.3 km McCormick Place (events only) 51st–53rd Street (Hyde Park) Metra trains only 7.0 mi 11.3 km 57th Street Chicago "L" Jackson Park branch 7.9 mi 12.7 km 63rd Street Metra Electric to South Chicago Calumet to Chicago Kensington/115th Street Metra trains only Red to Howard (planned) Metra Electric to University Park & Blue Island 130th (planned) I-94 Bishop Ford Freeway Calumet River 19.0 mi 30.6 km Hegewisch Illinois Indiana reroute peak hours Hammond Gateway maintenance and storage facility Hammond (closed) to South Bend Airport Grand Calumet River Downtown Hammond (future) South Hammond I-80 / I-94 Little Calumet River Munster Ridge Road Amtrak to Chicago CSXT Elsdon Subdivision Munster/Dyer Main Street Dyer Amtrak to New York
This diagram: view talk edit

NICTD planned to apply for federal funding for a preliminary engineering study and environmental survey of a Hammond-to-Lowell leg in 2009. As of 2008, that leg had a projected price tag of $551 million. As of 2019, the cost has increased to $665 million. NICTD was awarded funding in the spring of 2020 and the line broke ground in October 2020. The project is estimated to open to revenue service in May 2025.

The new line will run through Munster to Dyer, with a possible later extension to St. John, and trains will run as shuttles between Hammond and Dyer during off-peak hours. The alignment of the new branch leaves the old CSS&SB main immediately before the original Hammond station. Hence, the NICTD built the Hammond Gateway station to serve both branches.

At a legislative hearing in October 2008, NICTD officials said they would drop further study of a Munster-to-Valparaiso route, and begin study of a Gary–Valparaiso route. At the hearing, NICTD officials said the projected cost of $673 million for the Munster-to-Valparaiso route as well as low projected ridership would have made it ineligible for federal funding and opted to study the Gary-to-Valparaiso route instead. The Gary-to-Valparaiso route would utilize the partially abandoned former Pennsylvania Railroad line. NICTD officials contend the shorter length of a Gary-to-Valparaiso run and the chance to use existing tracks there may make it a lower-cost alternative to the Munster-to-Valparaiso route.

In the 1980s and 1990s, there was some discussion about the possibility of extending the line from South Bend east to Elkhart County, Indiana. In 1988, Elkhart, Indiana Mayor James Perron pushed for the government to look into making long-term plans for an extension into his city.

There are proposals to replace the South Bend terminus with a new station.

There is a proposal to reestablish a station in New Carlisle.

The line operates over the tracks of the Metra Electric Line from Millennium Station to Kensington-115th Street. Metra owns the track in this territory. Per a long-standing non-compete clause with Metra, outbound South Shore Line trains to Indiana only stop at Metra Electric stations to receive passengers; inbound trains to Millennium Station only stop at Metra Electric stations to discharge passengers.

South Shore Line trains make the following station stops:

State	Fare zone	Location	Station	Mile (km)	Avg. weekday ridership (2019)	Connections and notes
IL	1	Chicago	Millennium Station	0.0 (0)	4,227	Metra: ■ Metra Electric CTA Bus: 4, X4, 6, 19, 20, 26, 60, N66, 124, 143, 147, 148, 151, 157 Chicago "L": Red (at Lake), Green Brown Orange Pink Purple (at Washington/​Wabash) Pace Bus: 855 Plainfield–East Loop Express VALPOtransit: ChicaGo Dash
			Van Buren Street	0.8 (1.3)	977	Metra: ■ Metra Electric CTA Bus: 1, 3, 4, X4, 6, 7, J14, 26, 28, 126, 130, 147, 148, 151
			Museum Campus/11th Street	1.4 (2.3)	166	Metra: ■ Metra Electric CTA Bus: 1, 3, 4, X4, 12, 130, 146
			McCormick Place (special events only)	2.7 (4.3)	0	Metra: ■ Metra Electric CTA Bus: 3 King Drive, 21 Cermak
			53rd Street	6.5 (10.5)		South Shore service withdrawn October 16, 1966, replaced by 57th Street
	2		57th Street	7.0 (11.3)	271	Metra: ■ Metra Electric CTA Bus: 15 Jeffery Local, 28 Stony Island, 55 Garfield, 171 U of Chicago/Hyde Park
			63rd Street	7.9 (12.7)	3	Metra: ■ Metra Electric CTA Bus: 63 63rd
			Kensington/115th Street	14.5 (23.3)		South Shore service withdrawn February 15, 2012
	3		Hegewisch	19.0 (30.6)	862	CTA Bus: 30 South Chicago Pace: 358 Torrence, 364 159th Street
IN	4	Hammond	Hammond Gateway	20.8 (33.5)	1,345
		East Chicago	East Chicago	23.4 (37.7)	1,493	East Chicago Transit: E1 Griffith Plaza, E2 Crosstown, E3 West Calumet GPTC: R1 Lakeshore Connection
	5	Gary	Gary/Chicago Airport	28.0 (45.1)	80	GPTC: R1 Lakeshore Connection
			Ambridge	29.2 (47.0)		Closed July 5, 1994
			Buchanan Street			Closed
			Gary Metro Center	30.9 (49.7)	426	GPTC: R1, R3, BMX, L1, L2, L3, L5
			Miller	34.7 (55.8)	339	GPTC: L2 Oak/County Line Rd
	6	Ogden Dunes	Portage/Ogden Dunes	38.9 (62.6)	237
		Dune Acres	Dune Acres	44.7 (71.9)		Closed 1994
		Porter	Dune Park	46.0 (74.0)	474	V-Line: Orange Line
		Porter County	Tremont	47.0 (75.6)		Closed June 2, 1986, replaced with Dune Park
	7		Kemil Road			Closed July 5, 1994
		Beverly Shores	Beverly Shores	50.4 (81.1)	47
	8	Michigan City	Willard Avenue			Closed July 5, 1994
			11th Street	55.8 (89.8)	102
			Carroll Avenue	57.5 (92.5)	172	Michigan City Transit: 3
	9	Smith	LaLumiere			Closed July 5, 1994
	10	Rolling Prairie	Rolling Prairie
		Hudson Lake	Hudson Lake	74.6 (120.1)	1
		New Carlisle	New Carlisle	76.3 (122.8)		Closed July 5, 1994
	11	South Bend	South Bend Airport	90.1 (145.0)	227	Transpo: 4 Lincolnway/Airport Greyhound Lines Coach USA
			South Bend			Current Amtrak station, South Shore service withdrawn November 21, 1992
			South Bend			Closed 1970, located in downtown South Bend

• Proposed new South Shore Line station in South Bend

• CERA (1960). Electric Railways of Indiana. Chicago, IL: Central Electric Railfans' Association. p. I-20.
• Middleton, William D. (1970). South Shore: The Last Interurban. San Marino, CA: Golden West Books. ISBN 978-0-87095-003-2. OCLC 104029.
• Middleton, William D. (1999). South Shore: The Last Interurban : Revised Second Edition (Railroads Past and Present) (2nd ed.). Indiana University Press. ISBN 978-0-253-33533-3.
• Middleton, William D. (1998). "Insull's Super-Interurban". In Cohen, Ronald D.; McShane, Stephen G. (eds.). Moonlight in Duneland: The Illustrated Story of the Chicago South Shore and South Bend Railroad. Indiana University Press. ISBN 0-253-33418-7. OCLC 38862554.
• Ogorek, Cynthia L. (2012). Along the Chicago South Shore & South Bend Rail Line. Images of America. Charleston, South Carolina: Arcadia Publishing. ISBN 978-0-738-59419-4. OL 25977909M.
• SouthShore.Railfan.net. "Chicago South Shore and South Bend Railroad (NICTD)". southshore.railfan.net.
• Van Hattem, Matt (July 5, 2006). "South Shore Line – The commuter railroad linking Chicago and South Bend, Ind". Trains.

• Official website
• Chicago, Illinois / South Bend, Indiana: The South Shore Line
• Hammond, Indiana News Briefs November 2003
• Northern Indiana Commuter Transportation District – Our History