It shouldn't be possible
Now the Tokyu coaches are ordered against GM/RT2473 (or its immediate predecessor) spec where section B7 tells us it is not possible to apply traction power if a door is open, doesn't say anything about the brakes.
Bet it rolled towards Grand Canal Dock
If you have the coach number time to tell the RSC as the black box will have it all recorded as will the CCTV which if the door was open does capture part of the platform edge. If it was southbound at 18:29 it was train id E256 18:00 Howth Bray.
I have experienced slight movements but nothing of the order of 7 feet
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