You have to turn either your trains or your whole map by 90 degrees, because tracktrains in source always start in a certain direction.
My sounds never stop and my trains only go once
Dont use an ambient_generic for the sound, use the 'Move Sound' field on blue_train 1.
train_blue_a2
OnPass blue_train 1 Teleport
Do you need to anything special for there to be the train kill icon? Because I have the trigger_hurt's damage type set to "train" and nothing occurs (there's also no option for it).