Jim70,
if you tell us about which accessories, we can help.
many of the postwar accessories with three wires are easier to set up with a separate fixed accessory power source (or ACC posts on the transformer) and then use the third wire off of the FasTrack isolated outside rail to trigger the accessory.
They were triggered with a contactor that temporarily completed both hot and common from the weight of the train.
even with two wire accessories, I prefer not to power them with track power.
