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In article ,

Er, Hertford North maybe but certainly not Hertford East!

Oh Fcuk - geography error...

Almost bound to be limited to the Thameslink specific 8 or 12 car
fixed formation units, as they will be dual voltage, have high
acceleration, and have the ATO required for the core route between
StP and Blackfriars. Running any form of stock with different
performance, and especially without metro style doors, would wreck
the timetable.

So not the IEP half trains planned for Lynn?

Additionally to above IEP is inconceivable for gauging reasons too.
Thameslink is tight for 20m vehicles, IEP is to be 26m vehicles with
platform and structures alterations necessary nationwide...

Paul S