could stock be displaced from elsewhere to help strengthen Norwich-Liverpool? It seems daft to have what are now rather high-spec 158s on the Robin Hood Line, for example.
Agreed (though no dafter than seeing 100mph Turbostars on routes like Glasgow - Anniesland, Birmingham - Walsall etc).
The plan was for Northern to send some 156s to EMT to go onto routes like Skegness/Mansfield/ Ivanhoe, releasing 158s for the Norwich - Liverpool. I think this was a really good idea, I just hope there are more 156s than the initial four suggested, as even a four coach train will struggle with loads like Liverpool - Manchester...
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Although it wont happen (it'll cost extra) am I the only one that thinks this route should have some 'faster' services operated by LHCS? Should reduce pressure on the 158s. May even allow all 158 services to be 4 car.
Obviously it would need to be through wired for DVT operation at the other end due to the reversals. Saying that, these would be good ones to have avoiding Ely. Perhaps even fast from Norwich to Peterborough on some.
Please do pull me up if there are any obvious reasons why it couldnt happen, excluding costs, because we already know it wont happen for this reason. Its far cheaper to have people standing in the aisles, instead of putting an extra train on.
What spare stock (apart from a surplus of Mk3 buffet cars) and what spare paths?
Bear in mind that the Liverpool - Norwich service needs to get through a catalogue of bottle-necks on its route. The line through Warrington is carefully timed with a Pacer narrowly squeezed between the TPE/EMT services, congested platforms 13/14 at Manchester Picadilly, few spare paths through the Hope Valley, the single track chord at Dore... IIRC the southbound service has to cross the northbound ECML
twice at flat crossings (and there aren't many spare paths there)... plus the general congestion you get at stations like Sheffield/ Nottingham/ Peterborough. Basically, the service needs to negotiate every big bottle neck north of London apart from Welwyn Viaduct! Finding spare paths isn't going to be easy...
Sorry to spoil your "why do people have to stand on a 158 when there are Mk3s sitting idle" rant.