SEPTA's subway–surface trolley route 34, also called the Baltimore Avenue subway line, is a trolley line operated by the Southeastern Pennsylvania Transportation Authority (SEPTA) that connects the 13th Street station in downtown Philadelphia, Pennsylvania, to the Angora Loop station in the Angora neighborhood of West Philadelphia. Route 34 will be rebranded as the T2 as part of the transition to SEPTA Metro.

At 10.1 miles (16.3 km), it is the shortest of SEPTA's five subway–surface trolley lines, which operate on street-level tracks in West Philadelphia and Delaware County, Pennsylvania, and in a shared subway with rapid transit trains in Center City.

Starting from its eastern end at the 13th Street station, Route 34 runs in a tunnel under Market Street. It stops at underground stations at 15th Street, 19th Street, 22nd Street, 30th Street, and 33rd Street. From 15th to 30th Streets, it runs on the outer tracks in the same tunnel as SEPTA's Market–Frankford Line.

Passengers may transfer free of charge to the Market–Frankford Line at 13th, 15th, and 30th Streets and to the Broad Street Line at 15th Street. Connections to the SEPTA Regional Rail are also available. Underground passageways connect the 13th and 15th Street Stations to Jefferson Station and Suburban Station.

Route 34 surfaces at the 40th Street Portal near 40th Street and Baltimore Avenue (US 13), then heads west on Baltimore until it ends at a loop at 61st Street.

The Delaware County and Philadelphia Electric Railway Company installed transit tracks for horsecars running along Baltimore Avenue as early as 1890, but it was the arrival of the electrified trolley two years later that allowed the extension of the line westward to the new community of Angora.

The line was routed into the subway–surface tunnel on December 15, 1906. The route was called the Angora Line until it was given the number 34 in 1911.

In April 2020, the line's operations were suspended due to the COVID-19 pandemic. Service resumed on May 17, 2020.

In 2021, SEPTA proposed rebranding their rail transit service as "SEPTA Metro", in order to make the system easier to navigate. Under this proposal, the subway–surface lines will be rebranded as the "T" lines with a green color and numeric suffixes for each service, and Route 34 would be renamed "T2 Baltimore Avenue." SEPTA described that "most comments were positive" in the public comment period for this rebranding project.

All are in the City of Philadelphia.

Neighborhood / location	Images	Station or stop	Connections	Notes
Market East		13th Street	SEPTA Metro: Market–Frankford Line, Route 10, Route 34, Route 13, Route 11, Route 36 SEPTA City Bus: 27, 31, 32	Closed between 12:30–5:00am
Penn Center		15th Street	SEPTA Regional Rail: all lines (at Suburban) SEPTA Metro: Broad Street Line (at City Hall), Market–Frankford Line, Route 10, Route 34, Route 13, Route 11, Route 36 SEPTA City Bus:4, 16, 17, 27, 31, 32, 33, 38, 44, 48 SEPTA Suburban Bus: 124, 125	Late night terminus
		19th Street	SEPTA Metro: Route 10, Route 34, Route 13, Route 11, Route 36 SEPTA City Bus: 17, 31, 38, 44, 48, 62, 78 SEPTA Suburban Bus: 124
Center City West		22nd Street	SEPTA Metro: Route 10, Route 34, Route 13, Route 11, Route 36 SEPTA City Bus: 7, 31, 44, 62 SEPTA Suburban Bus: 124, 125	Replaced 24th Street station
University City		Drexel Station at 30th Street	Amtrak (at 30th Street) NJ Transit: ACL Atlantic City Line (at 30th Street) SEPTA Regional Rail: all lines (at 30th Street) SEPTA Metro: Market–Frankford Line, Route 10, Route 34, Route 13, Route 11, Route 36 SEPTA City Bus: 31, 49, LUCY	No direct passage to 30th Street Station
		33rd Street	SEPTA Metro: Route 10, Route 34, Route 13, Route 11, Route 36 SEPTA City Bus: 30, 31, 49, LUCY	Serves Drexel University
		36th Street	SEPTA Metro: Route 13, Route 11, Route 36 SEPTA City Bus: 21	Serves University of Pennsylvania
		37th Street	SEPTA Metro: Route 13, Route 11, Route 36 SEPTA City Bus: 40, 42, LUCY	Serves University of Pennsylvania, Children's Hospital of Philadelphia
Spruce Hill		40th Street Portal	SEPTA Metro: Route 13, Route 11, Route 36 SEPTA City Bus: 30, 40, 42, LUCY	End of Routes 11 and 13 concurrency
		41st & Baltimore
		42nd & Baltimore	SEPTA City Bus: 30
		43rd & Baltimore		Serves Clark Park
		44th & Baltimore		Serves Clark Park
		45th & Baltimore
		46th & Baltimore
Cedar Park		47th & Baltimore
		48th & Baltimore (WB)	SEPTA City Bus: 64
		Florence & Baltimore (EB)	SEPTA City Bus: 64
		49th & Baltimore	SEPTA City Bus: 64
		50th & Baltimore
		51st & Baltimore
		52nd & Baltimore (WB)	SEPTA City Bus: 52
Angora		Broomall & Baltimore (EB)	SEPTA City Bus: 52
		53rd & Baltimore
		54th & Baltimore
		55th & Baltimore
		56th & Baltimore
		57th & Baltimore
		58th & Baltimore	SEPTA Regional Rail:      Media/Wawa Line (at Angora) SEPTA City Bus: 46, G
		59th & Baltimore
		60th & Baltimore	SEPTA City Bus: 46
		61st & Baltimore		Also called Angora Loop

• "(Route) 34 (Schedule); Angora To Center City via Baltimore Avenue" (PDF). SEPTA. August 31, 2008. Retrieved November 4, 2008.
• 1974 Philadelphia Trolley Brochure, pages 12-13 and 14-15