The bottom of the TIU has the letter L on it definitely. This may have been an early one. The power supply to the bottom loops is a MTH Z-4000 and the upper an old ZW. There are no blocks on the layout. The upper loops go through the variable voltage feeds on the TIU and the Z-4000 the fixed voltage. The MTH engines work okay on the upper loop. The bottom loops they do not react to any command and I get the engine not on track. Once in great while when I get the engine not on track the engine will react bypassing the startup command and moving. The short setup track is powered when I use it by one of the fixed voltage outputs from the TIU and the Engines react as they should. I do not get Engine not on track signal on the Remote. Everything was working okay on Saturday but Sunday the bottom loops stopped working in the DCS mode. The loops still work with the Lionel command system. The track is a mixture of Atlas and Gargraves. The switches are Atlas or Ross and the Ross use DZ2500 switch machines. Tracks are all powered.
