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Besides JR West being poorer, I've always held the belief that they run the shitter trains on lines where they don't like the user base. The Hanwa/Loop line is lol. The Nara line is full of tourists and students.
I imagine they'll start shifting things around once the 323s come in proper. Although besides it all, I don't think JR West really subscribes to the shinkeiretsu densha concept, because of the above in that they're poorer.
Now, Hankyu. There's a classy one.