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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You should be in a VC meeting when he works from home

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I don't even hear it anymore. Or it's like white noise and helps me sleep.
End of conversation
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