They were used in unit trains for transporting coal

Here is a Atlas 62462 Comet II Cab Car 3rl NJT

Model Number: 50002902

opening doors and latch couplers

and all of the necessary driver circuitry to enable easy and direct connection to the output of any Circuitron detection circuit such as the DT-4

Walthers 949-4319 HO Single Square Modern Parking Lot Light VariantsUnitPrice_number_53.47 They were used in unitThis is a Walthers 949 4319 HO Scale Single Square Modern Parking Lot Light 3 3 4 Tall x 1 2 Wide 9. 5 x 1. 2cm. It Features: North American style lights with square fixtures & poles, Perfect for contemporary industries, stores parking lots & more, Great detail for day or night scenes, Fully assembled from tough metal parts, Install in minutes in new or existing scenery, Easy to wire with plug & socket or factory installed leads as appropriate,