Subway vs Commuter Rail in Japan: both are high frequency, both have high-capacity designs, only superficial differencespic.twitter.com/4eEgmZkioi
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In Boston, commuter rail frequency is much lower than subway frequency, has a capacity-throttling layout, and uses locos instead of MUspic.twitter.com/MAyDbdyTzF
"Commuter rail lines and subway lines have different predecessors" yes, as was the case in Japan too. Convergent evolution is a thing, folks
That commuter rail in Boston is still using loco-hauled trains etc is evidence of arrested development, not reflective of passenger needs
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