I think a similar arrangement was organised for a week in summer when the WCML was closed at Wigan and Virgin were running West Mids - Scotland via the Styal line (and presumably Bolton). The Northern Piccadilly - Airport shuttle didn't run and the Cleethorpes trains stopped. I'm sure that they used to stop in one direction back in FNW days too (and perhaps for a while after). Given that this saves Northern an EMU it seems like not a bad idea permanently really. Does it have negative consequences beyond increased MIA - CLE journeytime and 1 fewer fast per hour?
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Yes indeed. I think I see now
If I were on the right side of the Pennines I'd get a train down there and have a nosey around
Unfortunately that will have to wait, and I shall simply thank you kindly for pointing me in the right direction and try to find some time to skim through the SSC Metrolink Extension thread.