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A general 'rule of thumb' is that, owing to platform lengths at many stations. the maximum length would be 10 cars (2 X 5 car units), or 12 cars (3 X 4 car units); these and other combinations may exceed this, but if you see longer formations, they would more than likely be either: A) failed units being rescued by other unit(s) already in service, or B) empty coaching stock workings, which have no need to call at stations, hence the relaxation of rules. I'm reliably informed by a driver friend that the former accounts for most instances of overlong trains.
Last edited by Dave Rowland; 7th October 2009 at 08:57.
Reason: extra info
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