Ring bell trigger - timed control

Hi, can anyone tell me if there is an AI 'ring bell' trigger that can be set to a desired duration? I'm trying to use it in a yard setting, but my trains rattle off into the distance with bells still ringing.............cheers!
I place a "Ring_Bell" or "Ring_Bell_BiDirectional" where I want the bell to start ringing, and a second one where I want the bell to stop ringing ... as well as "Sound_Horn" and "Sound_Horn_BiDirectional" (which only give one blow of the horn, so I place 4 or 5 of them @ 3 ties apart)
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