The exhibition consists of a recreated station platform and visitors can find out about the various railway companies which once operated out of the city. The steam locomotive exhibited in front of the museum is a 3 ft (914 mm) narrow gauge locomotive built for the County Donegal Railways Joint Committee in 1907 by Nasmyth, Wilson &Co., originally numbered No.16 and named "Donegal". She was superheated in 1926 and then renamed and renumbered as No.4 "Meenglas" in 1937. The locomotive was withdrawn from service on 31 December 1959, when the CDJRC ceased to exist as a railway company.