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https://www.theforthbridges.org/news-from-the-forth-bridges/disused-tunnel-at-forth-road-bridge-made-safe/
Just found this link, you are correct it was the old North Queensferry tunnel. Knew a tunnel in that area was infilled around the bridge works time and assumed, wrongly, it was the Rosyth...
I believe the tunnel under the M90 motorway was filled in during the bridge works for the Queensferry crossing. I think it’s filled with the large foam blocks should allowing removal and reuse if need be. I could be wrong but vaguely remember this mentioned before
An additional rush hour service from Edinburgh to Glasgow Central via Carstairs. Journey time roughly the same between the two cities with few stops invetween for dwell times. Full length platforms allowing 9 car trains which would be a crowd buster certainly during the peak times. 1 or 2...
what is the highest mileage a single unit covers in a day. I’m thinking along the lines of some cross country units which do Penzance Glasgow then back to York but I could be way off?