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Maybe not Birmingham-Cambridge/Stansted but for example using 22x units on Birmingham-Leicester and Birmingham-Nottingham would free up enough 170s to double up on Cardiff-Nottingham and Birmingham-Stansted where the door layout certainly helps.
edit: 22x can also take advantage of 125mph...
If XC were to take on new AT300s it would be a much better idea to order 8/9 car 802s or similar for Intercity routes, and free up more 22x units to double up on services for which 4-5 cars are completely inadequate. Running 802s on services that the 170s currently operate would increase station...
Most trains that call at Lelant Saltings also call at Lelant, albeit by request. Only exceptions are 2tpd on a Saturday, which are admittedly the only St Ives-bound services to call at LTS on a Saturday.
Only ever seen it in use once in 2017. As a side note, it would be far more useful for the bay platform to be facing Northbound to allow Tarka Line services to terminate instead of continuing to St James Park (although Barnstaple trains being extended along the WoE main line may somewhat reduce...
Voyagers use SDO on some parts of the CrossCountry network. I remember on 8+ car services through Totnes heading northbound using SDO, although I have no idea how they implemented it.
I'm also surprised at the lack of mentions for the Meridians. Being very similar to the 220s they could...
I guess it would be a push given that this country didn't allow 125mph DVTs to carry passengers, despite excellent theoretical crashworthiness (although Great Heck does suggest otherwise)
If Amtrak could get the flat-ended Metroliner up to 125, a newer Siemens fleet that already does 110 could easily be modified.
Failing that, a 125 mph loco hauled set (maybe a 67?) could improve comfort. Ik it's diesel but the units have to get to Penzance somehow.
An 8 car IEP would be an improvement, although I doubt a permanent 8-coach train is viable or sensible as a 4-carriage 220 is already more than enough for extremities like Aberdeen or Penzance/Newquay.