In 1942, a hall for locomotives and rolling stock was added at Tomteboda railway station in Stockholm.

The Museum has the use of two yards with tracks and several large buildings, including two round loco sheds and a sizeable workshop.

The present collection, which is one of the finest of its kind in the world, contains more than 100 locomotives, some 150 coaches, and several hundred other items of rolling stock.

Apart from locomotives and rolling stock, tools, instruments, and models, as well as crockery, textiles and art in specially built settings are displayed at the museum.

The museum collection of photographs contains several hundred thousand pictures, and the museum is currently transferring copies of negatives, glass plates into digital form to make them more available for the public.