func_train trap

I have just put in a pretty sweet trap in my portal map, that is a func_train and follows a Path_Track entity, but I have it so the train is activated by touching a invisible nodraw func_button that OnPressed starts the train forward. But unfourtinitly when I get all excited about how it is going to work, I start up the map and the train doesn't work, or should I say the func_button does not start the train. Any suggestions?

the OnPressed input in func_button retains to the user pressing the use
key, which is "e" by default. I think what you want is a trigger_once
entity instead, The player has to walk thorugh it, so position it so he
does. And use the "ontrigger" output for the trigger_once.

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