working on the chain gang

[Mr Bunt]

When did logic ever enter post-privatisation railway engineering? All this wittering about a new London - Brighton line to be called BML2 amuses me.

Here's a plate on a BML1 structure - the London end footbridge at Southampton Airport (Parkway), and it's in miles and chains too!

Bournemouth Main Line, not Brighton at all

[R. pike]

No it is a new footbridge in Arlesey..

[Bryan]

ECML mileages count from zero at KX to York. Then from zero at York to Newcastle, zero from Newcastle to the border and from zero at Edinburgh to the border.

Agreed, 52A. But do the bridge number series start at the same zero mileposts I wonder. I don't know.
Oh for access to GEOGIS; - Sorry, CARRS!

" ELRs came into general use in the late 80s prior to that a numeric route code had been tried.
Can be easily found in Quail maps. .... "

There is also an alpha-numeric system in internal use called 'Line Of Route' (LOR) principally for non-engineering purposes I'd think, and is found in such as Sectional Appendix Table 'A' line diagram page headings and Weekly Operating Notice route sections; e.g. LN101 (the modern NR 'LNE' Route), and EA1310 ('East Anglia' Route).
Is that anything to do with the numeric code you refer to? Or is it the method used in the 1947 LNER Sectional Appendices?

" .... Unless that is the structure is an Overhead Power mast then it is located in KMs. "

... for the ECML electrification (including the earlier GN Suburban elec'n), and presumably other relatively modern schemes, yes.
But to be fair this isn't always so everywhere. For example the London - Liverpool/Manchester sections at least of the WCML elec'n, I'd have thought would be numbered imperially, and the early GE overhead structures (e.g. Liverpool Street - Southend Vic., are definitely No.'d in Miles / nnth structure in the mile.

GEOGIS did have its uses. I used it a lot, especially when I used to have to provide the renewal update details. I have also had the pleasure? of trying to decipher old rolling marks in the rails for miles on end to update the records for missing sections of record in existing track.

Older OHLE schemes would have been in Imperial Miles and Chains but any new installation after 1980ish would be recorded in KMs.

The Numeric code I mentioned is not the same as in the WONS, WENs, PONs or STNs etc
It was totally diferent, I have a copy of the book somewhere and will try and dig it out if I can find it.
There was a series of London Underground style maps in it of BR as it was then (1980s I think) and bore no relation to Geographic reality as we know it.

[Boris]

Correct me if I am wrong but are not signs in metric not yet legal in the U.K.and can be orderd to be altered to miles or/and yards.

[Bryan]

Would that be for Highway use or Railway?
The metric measurements discussed so far are used for location and record purposes and are not used for Speed purposes these are still all in Imperial on the National network however I believe some Tramway systems are now in KM.

[Danby Wiske]

I believe some Tramway systems are now in KM.

Tyne and Wear Metro speed limits are in Km/h, and as far as I know they have been since it opened.

[StevieG]

Tyne and Wear Metro speed limits are in Km/h, and as far as I know they have been since it opened.

...As are, I'm sure, those on CTRL (... okay, "High Speed 1" ) - white numerals on a black background, rather than the reverse as are familiar on our national network.

[third-rail]

I believe some Tramway systems are now in KM.

Tyne and Wear Metro speed limits are in Km/h, and as far as I know they have been since it opened.

metro distance is also measured in kilometres