Had to replace the electric furnace with a gas furnace last fall, one thing lead to another, time to get the trains back running. Been playing around with the old CAB1 and Command Base, and thought, gosh if the base makes track signal, and the blue Legacy PowerMaster's listen to track signal, why do I need to fish out the blue CAB1L and blue ComandBaseL or whatever its called.
Answer, I don't. They work fine together.