waverley47
Member
- Joined
- 17 Apr 2015
- Messages
- 861
Is there anywhere the two different criteria are available to read?
I'd be interested to know how many lines in England would suddenly become viable if one used the Scottish criteria. I'm firmly in the "build it and they will come" camp (induced demand really does work on trains as well as roads), especially in light of Okehampton where passenger numbers were double expectations, which leads me to think the numbers on whatever models the DfT uses may need tweaking.
I'd also to be curious to know if any consideration is seriously given to the utility of diversionary routes. On that front I'd be thinking that avoiding Dawlish (in the light of 2014, even with all the improvements to sea defences) would be a considerable boost to the Bere Alston - Tavistock - Okehampton line, even with basic infrastructure that allowed a skeleton service through in terms of disruption.
Similarly Uckfield - Lewes might be more viable if one considers all the money saved by having a diversionary route to Brighton from London (with/without a new west facing junction at Lewes to avoid reversals), that avoids the need for mass cancellations and delayrepay payments in the event of a serious incident on the two track bottleneck.
Again, new thread, but no. It's all commercially sensitive information. Scotland puts a heavy premium on the social service aspects, and so we calculated things differently. The UKGov is far more concerned with cost, so we had to estimate highest possible cost, with pessimism bias. We did a best estimate, which takes several months and a good couple of hundred thousand pounds at minimum, and climbs from there based on the scale of the project.
I can tell you that no railway will ever satisfy a positive BCR if 'diversionary route' is the primary motivator. Not Uckfield, not the Waverley Route, not the Tavistock to Okehampton route, not ever.
It has to stand on its own merits.