Mainline Block Target Signal Lights change from green to red when trains move through its block. Light automatically resets to green when block clears. 153C contactor included. Lighting SKU: 6-22945 Dimensions: 7 1/8" Height Gauge: Traditional O Gauge price: 49.95 year: 2000 rail line: None Minimum Radius: None Catalog Year: 2000 Catalog Title: Classic Trains Vol. 1 2000 Road Number: None 153C Installation & Wiring Instructions Manuals Find the latest manuals in our support section. Replacement Parts Buy any replacement parts in our support section. Contact Contact a service station to fix your product