It would be cheaper in the long run but it would be interesting to know where the Grid supply point would be for Oxted to Uckfield.
You've hit the nail on the head there :P before the 171s were ordered, Network Rail asked the DNO to design and price a connection circuit to the electricity supply network (ie. cables from the nearest suitable part of the distribution network and substations at specified points on the line, and the cost to install them). This did not include any of the actual works to the line itself, only those required to get the electricity to the lineside.
Apparently Network Rail took one look at the price, and Southern instantly ordered the 171s :P .
The distribution network in that area is very sparse and difficult and expensive to extend, hence it's unlikely that this line will be electrified soon because of that reason.
*Source: I work for the company, have seen the network maps, and my boss was the one who designed and priced that connection for Network Rail :P
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Although the class 87's were indeed powerful locos, I find hard to believe that a class 87 in the circumstances you describe could out accelerate a class 390. Especially given that the class 390's employ distributed traction. However if you have some evidence that supports your claim I'd happily review this.
http://www.railforums.co.uk/showthread.php?t=89469&page=2
Post number 22. As I said, it's only something I heard before, I'm not claiming it to be the most reliable evidence. Would be interesting to see if anyone else has any information on this, and I will stand corrected if evidence comes up for the contrary.
I may have to get researching figures and get my calculator out as I'm actually fascinated now :P
Several long sections of the Midland Main Line have seen line speed limits increased to 125 mph since last December although more work needs to be done. This has been well documented in a thread in this forum and not surprisingly had been planned for sometime before that.
As for the class 91's. Given that they have never reached 140 mph whilst in revenue earning service and that their acceleration is less than spectacular, surely the leasing company would have re-geared them during their refit over ten years a go? This leads one to think that any potential re-gearing would not be as simple or indeed as worthwhile as you suggest.
As I put in one of my previous posts, I stand corrected about MML line speed. I was not aware of the change.
As for the second point, that is a fair point and one to consider. But the point still stands that regearing to 125mph will undoubtedly increase acceleration and reliability by a certain amount.
Now given your assertions that a class 87 could out accelerate a class 390 (and therefore a class 222), surely you would have had the same issues in the old days with class 87's and mk3's! To be honest in all of my years of travelling by train on our national network I've never met anyone who wanted the trains to be slower. To be honest I think the same goes for the rest of the developed world.
True, I may well have done, but I also never said that I'd prefer an 87+Mk 3 on acceleration grounds, and cannot comment on that as I never travelled on an 87 hauled train. And I'm proud to be the first that you've met then :P