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Hi Ryan,
By door spacings, I mean, looking at the side of the carriage; one door would be at 1/3 and a second door at 2/3 along the carriage. i.e. a 60ft carriage would have doors at 20ft and 40 ft. I hope that clarifies the situation. Much experimentation has been carried out on the best door spacings to give the best access/egress at the same time cutting down cold draughts within the carriage.
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