?Desiro & ?Class 317 length
317's south of the river? That's a new one on me.
The trains that usually run that line are class 455's. They are
externally identical to the 317's except 317's are built for
outer-suburban use and have better interiors.
The new train you came across wasn't a desiro but a class 458 'juniper'
unit which believe it or not is already in it's last days of operation.
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