The museum is housed in and around a Grade II listed former Victorian waste water pumping station. It is devoted to the technology, transport and industrial history of Walthamstow and the Lea Valley.
As well as the original and unique pair of Marshall 'C' class steam engines, the museum includes a machine workshop driven by line shafting, a collection of small pumps of different types, a two-thirds scale model of the famous London 'B' type bus built in Walthamstow by AEC and a display detailing the history of local railways.
Elsewhere on the site are a portable Marshall steam boiler, an original 1968 Victoria Line tube car, an extensive collection of fire fighting equipment and various historic vehicles.
There is also a museum shop and a canteen selling hot drinks and light refreshments