This engine shed may still be in production. Like many plastic structures, you'll see the same model offered by different companies at different times. Many of the model power offerings were at one time sold by AHM and Tyco. Pola of Germany actually made the structure.
IIRC this series of structures, which used the same basic parts, Were from first Revell, and then AHM. Superior Bakery, Two Stall Engine House, and a printer's shop, were all from the same basic building. I'd check several of the plastic structure companies like Model Power, Pola, and others to see if you can find the kit.