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Old 21st September 2017, 21:49   #361
class26
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Originally Posted by Kettledrum View Post
I was referring to Birmingham to Nottingham, and as 220's already operate at very fast speeds on Birmingham to Derby, I assumed that 222's would be fine.

Are there are severe speed restrictions Derby - Nottingham?
Yes, but for all trains. Derby to B`ham there is alot of 120mph (with 50 through Burton) so the 220`could definitely make use of their acceleration and higher speed.

Last edited by class26; 22nd September 2017 at 07:26.
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Old 21st September 2017, 22:08   #362
MichaelAMW
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Originally Posted by edwin_m View Post
Sheet Stores is 10mph one way and 15mph the other, and the curve round to Trent is 30mph. Between Derby and Sheet Stores most of the line is 100mph or possibly a bit more, with lower speeds on the Nottingham branch. There are no differential speed restrictions. Even if it isn't possible to get over 100mph the greater acceleration of the 222 ought to shave a minute or two off this section. Several evening London-Nottingham trains reverse there and run to Derby, either empty or in service, so it would be possible to compare their timings with the 170s that work the hourly non-stop.
There are some differential speeds between Sheet Stores and Derby, up to 110HST on the Up and 115HST on the Down, with the normal speed up to 100. 80 Trent to Nottingham.

The 2315 St Pancras to Derby is a non-stop 222 and is given 19 minutes; the Cardiff trains generally get 21 minutes.
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Old 21st September 2017, 22:43   #363
NotATrainspott
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Originally Posted by class26 View Post
Yes, but for all trains. Derby to B`ham there is alot of 120mph (with 50 through Burton) so the 229`could definitely make use of their acceleration and higher speed.
Why is the limit so low through Burton? A reduction like that has a massive impact on journey times.
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Old 22nd September 2017, 09:53   #364
edwin_m
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Originally Posted by NotATrainspott View Post
Why is the limit so low through Burton? A reduction like that has a massive impact on journey times.
Probably the reverse curves to spread the tracks out for the island platform.
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