Wiring a Block System

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old school, still works. 1954 Lionel pages 35 & 39.

Without looking at the other two answers, it sounds like you left out a block. You need three blocks to run two trains. Train 1 moves into block A, which is dead, but activates block B in which train 2 was waiting. Train 2 moves into block C which is now dead, but activates block A which Train 1 was waiting. Train 1 moves into Block B which is now dead, but activates Block C. Train 2 now moves into Block A which is now dead, but activates Block B. And so it continues. With any number of trains, you need at least 1 more block than trains.  

I also forgot to mention, your e-unit may be going to neutral in the block. Set them to forward only.

Have you wired it to retain a few volts to prevent the e-unit issue?

Although it can be done without them, I highly recommend relays,operation will be much smoother without arcing and delays can be made between trains. Also block signals are easy to wire with relays. Shown here

http://www.jcstudiosinc.com/Bl...=612&categoryId=

Dale H 

Sway: engines are locked in forward.

Dale: I am using Radio Shack # 276-1146 Full Wave Bridge Rectifier 4amps. 50 volts.

DPDT Plug-in-relay #275-0218