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It basically means a train that starts at a single origin but the path splits at a point and goes to location A or location B as required, so like the letter Y.
Bicester to Aynho is sparsely signalled with 2 aspect, its effectively just two signal sections between just north of Bicester to Aynho. One from Bicester to Ardley tunnel, then one from there to Aynho Jn.
Ardley has been on the cards and being developed for a number of years, this isn't really anything new. The issue will be what gauge can be sorted for the Chilterns or you are in for some very inefficient messing about with Intermodals. If you read SABRE, the "significant improvements" to J10...
Basically, and even that isn't particularly easy depending on where they need to be as it isn't always halfway along as most peoples immediate assumption will be.
Wolves is only two tracks to Wolves North Jn, and I can't see where you can fit another platform on the up side. Your other idea was proposed around 10-15 years ago for Brinsford.
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