coin operated train set ?

seen a coin operated train set at a pizza place and have a friend that wants to do the same thing in his tavern on a shelf around the bar. we have the train almost in place, and have the coin box from a coin operated wall game like a duck hunt or trapshoot. we need to know if anyone has any ideas how to incorporate the coin box into a timer and into the train set so that we can adjust the amount of time the train runs for each coin put in. the pizza place gives you a free pizza if the train stops in the tunnel, and my friend wants to give away a chicken dinner or something like that. the train he has plays the chicken dance song as it runs. any suggestions would be appreciated. thx