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articulation in the UK
The Tyne and Wear Metro units were designed as an articulated pair of carriages on three bogies, greater capacity was to be gained by linking the unit pairs into double and triple sets.
The Metro sytem was designed for far more units than the 78 plus two (the pair that were rebuilt after runing on the test track), that the Metro was actually allowed to order. ie the below surface station platform lengths were set up for regular use of triple units. (I hope that makes sense!)
It has been rare indeed to see more than the double units working service trains.
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