Does that include what were the few direct TPE Manchester Airport to Windermere services and if so, what units will Northern Rail be using on those services.
Initially anything they deem suitable from what's available but by the end of 2019 they must have a fleet of Regional Express standard trains to operate Manchester Airport to Blackpool/Barrow/Windermere/Liverpool (via Warrington) services plus any other services they choose to designate as Regional Express services.
The Regional Express trains must have 2+2 seating, tables, reliable air conditioning, a trolley service, wifi and plug sockets. Non-regional express standard trains can't be diagrammed to be used on regional express routes but regional express standard trains can be diagrammed to be used on any service.
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To start with I'd expect 156s, I don't think 142s are allowed. But possibly the new regional express stock once it comes in.
158s would be more suitable but using 158s would require some crew training and a fleet re-organisation.