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Old 17th June 2016, 11:37
ianrail ianrail is offline  
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Join Date: Nov 2009
Location: Reading
Posts: 327
I can see a disadvantage in that if one carriage develops a fault, the whole train needs to be taken out of service rather than just removing that one carriage. The same would apply if (say) a buffet or restaurant car was being updated.

Similarly, GWR had a programme last year to convert one carriage of its 2+8 HSTs from 1st to Standard class. I remember seeing some trains running in 2+7 formation whilst this work was carried out (or I presume this was the reason for the shorter formation). Again this seems preferable to taking the whole train out of service but perhaps there are members who have more knowledge of operations/engineering who can expand on this?
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