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Standing or sitting in the sections between carriages on a busy train, 'cos all the seats are taken.
Usually on an unplanned long-distance trip, where the seats are all booked in advance.
About as far from first class as you can get without going outside the train.
After missing the train we'd booked seats on, we had to travel corridor class until we got to Birmingham.
by Blue Jack November 23, 2008
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