This is the HO Scale Yard Office Kit by GC Laser. 3-1/4 x 2-1/2 x 2-1/8'' 8.3 x 6.3 x 5.4cm.
No yard would be complete without an office to house the yardmaster and all that paperwork.
All parts are laser cut to ensure accuracy and ease of assembly. Interlocking walls and bases keep parts aligned. Doors and windows are separate pieces and can be positioned open or closed. Complete instructions are included.