There's a few old, locked threads around this topic (
[1] [2] [3]), but nothing since 2016, so hopefully it's OK to re-open the topic...
I'm a moderately frequent (North) Cotswolds line user, and at the times/directions of day when there are 2 trains an hour on the Moreton-in-Marsh to Oxford section it's great, at the times when it's only 1ish the waits can be annoying. So, I have a personal interest in this!
As I understand it from earlier threads, the earlier re-doubling of the eastern section didn't go all the way to Oxford for cost / benefit reasons. However, part of that was the issues with the Oxford area signalling, which have now been resolved. Another part is the 3 stations between Charlbury and Oxford, 2 of which are the parliamentary-only halts.
Wolvercote Junction to Hanborough typically takes 5 minutes, 1 minute stopping allowance, then Hanborough to Charlbury in 7 minutes, total 13 minutes. A non-stop Charlbury to Oxford (eg 1P37) is 11 minutes for Charlbury to Wolvercote. A non-stop Moreton to Oxford (eg 1P40) is timed for Charlbury to Wolvercote in 9 minutes. The all-halts seems to do it in 20 minutes.
Personally I'd quite like 2 trains an hour in each direction, and I gather most of the local councils would too, plus the CLPG. You can't quite manage that with a stop at Hanborough, which while a smallish place, has a big catchment by road (even despite Oxford Parkway pinching people), and is growing rapidly with loads of new houses springing up). So, at least some extra 2 track is needed, though not necessarily all that much.
I figure there are four broad options:
- Re-double Charlbury to just before Hanborough
- Re-double Wolvecote Junction to Hanborough
- Re-double the lot (combine #1 and #2)
- Extra platform at Hanborough as small passing loop
Option #1 probably means either closing the halts, or expensively adding 2 more platforms, or making it all bi-directional so you can run wrong-line in the morning to reach the current platforms. Few bridges that might need work, and embankments.
Options #2 and #4 would mean an extra platform at Hanborough. #2 has some bridges and embankments that might need work, I'd guess similar number to #1, while #4 needs signalling and point work instead.
Assuming I've correctly picked up the points from the earlier threads, now that the Oxford area signalling is all done, and with some inflation thrown in, does anyone know the rough ballpark costings?