BR Steam Loco data

[Driver_Col]

Does anybody have any hard data regarding British Railways steam locomotive acceleration and braking?

I have recently run a BR "Jubilee" with an 8 coach train over a measured 3mile length of track with a 1 mile extension for braking. At the 3 mile marker it had reached 43mph (is that realistic?????), and came to a stop after 4000ft. If that same train was to brake from 80mph, it would obviously exceed the 1 mile braking distance. An LMS "Coronation" with the same train reached 56mph at the 3 mile marker (not surprisingly faster than a "Jubilee"!), and over shot the 1 mile braking distance!

If anybody can give me data such as..............

x locomotive at best acceleration will reach a speed of x/mph in x/mins (or x/distance), and will take x/mins (or x/distance) to come to stop from that speed

..... I would love to hear from you!

Thx. Colin.

 

[BLACKWATCH]

There's a few bits of data on here.
http://www.locoperformance.co.uk/edition20/brstandards.htm

 

[stovepipe]

I picked up an old mag last night which has some timed runs in with rebuilt Merchant Navy's on the SR line between Waterloo and Exeter/Southampton in the 1960's.

Picking out a few typical details of the 12/13 coach runs from standing starts:

miles mph
1.1 40
3.1 60/65
6.95 85/90

EDIT: these latter two were down a 1 in 250 bank.

These are probably close to the best runs ever achieved, which is why they were published. The writer Cecil J Allen regarded the MN boilers as having no rivals for power output among BR steam engines.

Sorry no info on braking distances.

SP

 

[Driver_Col]

Thx Stovepipe and Blackwatch. Info much appreciated. Re the braking distance, I am given to understand that as a result of a 1 mile signal spacing on a 90mph stretch of track, there-in is the braking limit! This means that I have some more work to do with the decel data in various loco specs!

Thx again. Colin.