The problem with 4-car trains (and which would be worse again with 2-cars) is that people stand all over the platform and get no indication until the train pulls in of (a) where the train will stop or (b) how long it is. This means higher dwell time while the train waits for everyone to get on.
Over here the PIS tells you how many coaches there are and there are stop boards which tell you where a train of a given length will stop.
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