Lionel O #148 Dwarf Signal
No. 148 Dwarf Signal Lights change from green to red when train occupies its block and automatically resets to green when train clears its block. Lights change from green to red wh... Show More
No. 148 Dwarf Signal Lights change from green to red when train occupies its block and automatically resets to green when train clears its block. Lights change from green to red when train occupies its block Automatically resets to green when train...