I am not convinced that the support on this forum comes from a good understanding of the numbers rather than just a general "railways are great - upgrade/build new/reopen everything". An enthusiasts response not dissimilar to many green activists support for wind power etc. perhaps.
Indeed, and a close examination of the options and cost/benefits for investing in the railways has left me a resolute opponent of HS2, given where we are starting from (which is the huge upgrade investment in the WCML, and the economic state of the country). Here is what I hope is a considered case against from rail supporter, not a Chiltern living NIMBY:
- the extra revenue generated from faster travel times may be illusory, Rail is already competitive from London to W Midlands/Lancashire/W.Yorkshire, the issue here is capacity and cost. And no way is HS2 going to be extended to Scotland, sometime or even ever. So what then - tilting TGVs? Alstom showed that this was technically demanding, and certainly expensive. The cheap way to add speed is to overlay ETRMS on the WCML and get the Pendos up to their design speed of 140mph.
- the issue is capacity on WCML, especially south of Rugby. So, reopen the GCML. No, that is not romanticism, it is genuine cost effective solution for freight or even, given the good curvature, 140mph Pendos. Electrification and top notch signalling would be easy and at low incremental cost with a rebuild - the clearances are great. The trackbed is virtually intact, as are the bridges/tunnels. The question is how do you get into London at the southern end. Well, TfL have virtually abandoned use of the Metropolitan fast lines from Wembley Park to Rickmansworth except in the peaks, you would just need a flyover to rejoin the WCML at Kenton. Add in a secondary route from Ashchurch Jn to the Chiltern Line with passing loops on latter and the underused Ruislip -Paddington line.
- the ECML does not have such capacity issues except for certain well known bottlenecks (Yes, even new tunnels/viaduct at Welwyn are cheaper than HS2), especially with the alternative freight route through Lincoln being developed.
As any glance at the threads on this forum indicate, there are large numbers of small or medium scale potential investments in the railway which have far better cost/benefits than HS2 (my favourites are Oxford-Cambridge and reopening Matlock-Buxton, others will have theirs). So why are all political parties in favour of this extravagant scheme in a period of austerity, and insufficient investment in infrastructure:
- they love big projects, especially if they can attach their names to it, just as the Olympics were a great party, but for the cost, so they should have been. Steady incremental stuff is boring and doesn't make the headlines
- it's jam tomorrow anyway, after the next election.