Frankfurter Feldbahnmuseum, Railway museum in Frankfurt, Germany

The Frankfurter Feldbahnmuseum is a railway museum in Frankfurt am Main-Bockenheim dedicated to 600 mm narrow-gauge field railways. Its collection comprises over 70 locomotives and about 200 wagons, including 20 steam, 40 diesel, 4 petrol and 4 electric locomotives plus 13 special rail vehicles. The vehicles are kept in several engine sheds and on the museum's own track, which runs about 1,200 metres from Kaiserdamm to Alter Flugplatz and on to Rebstöcker Wald.

The Frankfurter Schmalspurfreunde association was founded in 1975, and museum operations began in 1976 at a gravel pit in Mainflingen. The collection moved to the former Bundesbahn repair works in Frankfurt-Nied in 1979 and to the former Bockenheim tram depot in 1981. Since 1985 a permanent site at Rebstock was developed, and the museum opened there in 1987.

The collection reflects the significance of narrow-gauge railways in Frankfurt's industrial and agricultural past, with vehicles showing how these trains moved goods and people through the region. This heritage remains visible in the preserved equipment and layout throughout the site.

The museum operates functional vintage locomotives and wagons on demonstration tracks, allowing visitors to experience historical rail transport systems directly. Regular guided tours are available, and combination tickets with other Frankfurt transport museums can be purchased for broader access.

The collection holds the world's oldest surviving motor locomotive in original condition: a Deutz type CV petrol locomotive, on loan from the Deutsches Museum in Munich and listed in the museum's roster since early 2015. The museum also keeps the only operational En2t military field railway locomotive with Luttermöller drive, whose axle arrangement lets it take tight curves.