The Isle of Man Railway Museum in the village of Port Erin in the Isle of Man is a small museum of the history of the Isle of Man Railway from its founding in 1873 to the present, including the now-closed lines that served Peel, Ramsey (Manx Northern Railway) and Foxdale, and the remaining open line between Douglas and Port Erin.

The museum opened in 1975 when the Isle of Man Road Services, a subsidiary of the railway company, relocated to their new garage, which still exists today at the foot of the main platform. At that time, the railway operated only between Port Erin and Castletown, in an experimental season with the goal of reducing running costs. The following year, services were extended to Ballasalla, then returned to Douglas in 1977, since when the full line has operated. The building originally consisting of a metal frame with asbestos cladding, was extensively rebuilt in 1999. Prior to the opening, the original locomotive shed was used to store unserviceable locomotives. When rebuilt, the locomotive shed was returned to its original use and the goods shed converted into a shop area and porch added.

The museum is next to Port Erin railway station, the southern (or western) terminus of the railway, on Station Road in the village. The main exhibition hall is housed in a converted bus garage that once belonged to Isle of Man Road Services, itself a division of the old railway company which was nationalised in 1976. Since the museum was extensively rebuilt in 1998–1999, part of the old goods shed has been incorporated into the complex, the other locomotive shed still being used as a workshop to maintain the locomotives and for overnight storage purposes.

The following represents and main exhibits of locomotives and rolling stock contained in the museum since its opening in 1975; during events periods and photographic charters certain items of stock are removed and alternatives take their places where available; since 2014 F.75 and G.19 have been plinthed on an isolated section of track, joined on another plinth in 2020 by No.1 Sutherland. Remaining items are rail connected via the station's locomotive shed. It is common for these items to be swapped as required, with F.36 being removed for restoration in 2023 and its place taken by a variety of wagons for example.

No.	Name	Builders	Year	Exhibited
No.1	Sutherland	Beyer, Peacock & Co., Ltd.	1873	1976–1997, 2020–
No.4	Loch	Beyer, Peacock & Co., Ltd.	1874	1997–2001, in traffic 2024
No.5	Mona	Beyer, Peacock & Co., Ltd.	1874	2023–present I.o.M.S.R.S.A.
No.6	Peveril	Beyer, Peacock & Co., Ltd.	1875	1997–2020, 2022–2023
No.9	Douglas	Beyer, Peacock & Co., Ltd.	1896	I.o.M.S.R.S.A., due 2025
No.15	Caledonia	Dübs & Co., Ltd., Glasgow	1885	1975–1993, in traffic 2024
No.16	Mannin	Beyer, Peacock & Co., Ltd.	1926	1975–1998, 1999–2020
F.36	Royal Saloon	Metropolitan Carriage & Wagon	1905	1975–1998, 1999–2023
F.75	Ducal Saloon	Metropolitan Carriage & Wagon	1873	1975–1998, 2000-
N.42	Six-Wheeler	Swansea Carriage & Wagon	1879	1975–1999, now off-island
N.45	Six-Wheeler	Swansea Carriage & Wagon	1879	2023–present, privately restored
M.78	Drop-Side	Metropolitan Carriage & Wagon	1925	2000–present, between uses in traffic
H.1	Three-Plank	Metropolitan Carriage & Wagon	2000	2000–present, between uses in traffic
G.1	Closed Van	Metropolitan Carriage & Wagon	1873	2023–present, I.o.M.S.R.S.A.
Gr.12	Closed Van	Swansea Carriage & Wagon	1879	1975–1998, 1999–2023

Since it originally opened in 1975, the railway museum has housed a variety of major exhibits. Exhibits in the museum include two engines and two carriages as well as other equipment from the railway. The royal saloon, as used by Queen Elizabeth the Queen Mother in 1963 and by Queen Elizabeth II in 1972, are preserved in the museum. There is also a large display of photographs, posters and other memorabilia. In addition to the framed exhibits of old posters and the like, further displays are mounted on the walls of the station building itself in the waiting room and booking office. These were once part of the museum and donated by a preservationists group when the facility was first opened.

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  No.6 Peveril (1875)
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  Wagon H.1 (2000)
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  No.16 Mannin (1926)
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  Ducal Saloon F.75 (1873)
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  Station Diorama (1998–2014) removed to make way for No.1 Sutherland, which arrived in the hall for the 2020 season

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• British narrow-gauge railways
• Isle of Man Railway locomotives
• Isle of Man Railway rolling stock
• Isle of Man Railway stations
• Isle of Man Railway
• Isle of Man Steam Railway Supporters' Association

• James I. C. Boyd (1996). Isle of Man Railway. Volume 3: The Routes & Rolling Stock. ISBN 0-85361-479-2.
• A. M. Goodwyn (1995). Manx Transport Kaleidoscope, 2nd Edition.
• Robert Hendry (1993). Rails in the Isle of Man: A Colour Celebration. ISBN 1-85780-009-5.
• Norman Jones (1994). Scenes from the Past: Isle of Man Railway. ISBN 1-870119-22-3.

• Media related to Port Erin Railway Museum at Wikimedia Commons