Tank train car with ambiant yard sounds during fill up and the stereo brakes etc..
Better yet, a tank-fill accessory with sound. Somebody made a tank-fill station a while back, maybe MTH, but I don't think it had sound. It would be a lot easier to put a sound unit in a trackside accessory than in a tank car.
Passenger car with conductor leans out and yells all aboard and retracts when train pulls out.
Great idea. Build the conductor into the StationSounds diner.
Dance hall should be easy enough with music and dancing people.
Another good one. Build in a connection for an MP3 player so the customer can add his own favorite music. I'd go for Asleep at the Wheel or Bob Wills and his Texas Playboys - real dance-hall stuff. Have the dancers in hats and boots.
car on the track at crossing .Escapes at the last minute
Horrible idea. Just what we need, teach little kids that racing the train at a crossing is cool.