I consider myself a train expert. Here are some tips on how to identify trains in the wild (northern California) based on their calls:
Ding ding ding dong - VTA
Chugga chugga chugga chugga CHOO CHOO - Caltrain
Whispers of demons from deep within the Earth - BART 
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I was waiting for someone to be like, "what about Muni?" And then I would say, "the muni is so rare that no one knows its call," but then no one asked about Muni, so
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Replying to @__apf__
I just assumed that the doppler effect of everyone in every other mode of transit going faster than muni meant it always sounded like background noise.
4:46 PM - 8 Mar 2020
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