At Marks Tey on Greater Anglia’s Sudbury branch, the rear coach door is locked when arriving at Marks Tey due to the end of the coach resting beyond the platform, requiring passengers to walk through to the next coach to alight on the platform
Would SDO be used for Ty Glas until such time as the platform is extended rather than skip the station altogether ?
Is Ty Glas being extended for 3 carriage 756 trains or will it be able to accommodate 4 carriage 756 trains which other stations on the line could handle (unsure about Coryton) - it would provide greater flexibility if something unforeseen occurs
My guess would be that it wouldn't be worth the bother of setting up SDO for temporary use.
Just closing it for a while would be a lot less hassle (for TfW).
It would seem daft to me to only extend Ty Glas for 3 coach trains but I have no idea. And like you I'm not sure if Coryton could cope with 4 coaches anyway, but given that with the increased frequences and trains crossing over each other at Queen Street, it won't take much for things to fall apart some some flexibility might indeed be good!