Prefabricated steel pump house as installed by WM at their hump in Jamison Yard, Hagerstown, MD.  Prototype still stands (barely) but is inaccessible.  HO scale.

Assembled structure measures L 1 1/2″ x W 1″ x H 1 5/8″

Note: pictures show a painted and assembled item, product is an unpainted kit.

Package contents: (4) 3D-printed resin walls, (2) windows with glazing, and (1) each roof, floor, vent, and weather head