Caught a commuter train in Osaka last year with some crew members - we were packed in like sardines. One of the crew members actually passed out - and we didn’t know until the next stop, when some people exited the carriage and she fell to the floor unconscious! The crush was so bad, she had been kept upright by the other people around her!
Needless to say we all got off at that stop, with help from some station staff to extricate ourselves - they wanted us off the train as quickly as possible as we were ruining their punctuality!
Once she had recovered a little, we caught a slower, but less crowded train to Kyoto.