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That is a simplified yet more affordable option for certain and still maintains the use of the existing bridge removing two level crossings. I may also be possible to leave the loop in place for Norwich to Peterborough or Kings Lynn with this layout. However based on regularity of use I can...
I believe the sand trains use the loop line at the moment, it also future proofs the design. It would only need to be single track and unelectrified. The lake may be possible to bridge with just a couple of pillars, I believe it is an artificial lake so environmental concerns should be...
Less than HS2 but more than a packet of crisps. I am not a quantity surveyor so honestly couldn't tell you.
I would guess it wouldn't be a significant difference to some of the bigger ideas thrown around on this thread.
If the balloon loop was redoubled, and an extension was put across the empty land as show in the picture, all Peterborough traffic could be rerouted closing one level crossing. If the King Lynn line was then spurred off the Peterborough line north of the balloon loop exit that would shut two of...
Would the Queen Adelaide balloon loop qualify, Thetford to Peterborough is quicker via the balloon loop than via Ely, not sure if that is enough of a deviation under the OP's rules?
You do have 12 intermediate cars in the HT 180's and 11 2 car 175s at ATW, could be a case to upgrade all the 2 car 175 to 3 car and have a new 3 car set. Just because engines are 750 hp doesn't mean they have to use all 750hp or for that matter is there enough grunt in a 175 for an un-powered...
With the electrification going on would it be practical to remove the diesel engines in the Voyagers and add a pantograph coach for fully electrified services. Reducing weight, increasing capacity and creating the space required for the electrical gubbins?