#148 Dwarf Signal Lights will change from green to red when train occupies its block SKU: 6-12883 Height: 7.67716535 Width: 8.18897638 Dimensions: 1 3/4" x 1 3/4" x 2" Gauge: O Gauge Scale: Traditional Power: Electric Catalog Year: 2013 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