Loading gauge and structures, q?s | District Dave's London Underground Site

dw54
Guest

Loading gauge and structures, q?s May 7, 2009 1:57:51 GMT

Post by dw54 on May 7, 2009 1:57:51 GMT

1) Is anyone here able to point me to a URL, or email me a doc/diagram with the actual loading gauges for Met, District and subvariations; and for DLR? (C3 would also be nice, can't get a usable image from "Joyce")

2) From posts on various forums, I have gleaned opinions that standard or nominal platform height (above rails) for LU are:

a) SSL: 990mm
b) Tube: 610mm
c) Shared route: c 800mm

Can anyone here either confirm these opinions, or correct the data? Also, is this a parameter that varies widely from stop to stop, or in sections with different histories: for example the platforms on ex-GE lines being different to the Tube sections?

3) Is anyone able to help with the DLR platform height and third rail positioning and dimensions data? I assume with DLR very little height variability - correct?

Thanks in advance

David
Perth, Western Australia
(dee doubleyou fifty four at live dot com dot ay you)

stanmorek
Guest

Loading gauge and structures, q?s May 14, 2009 21:41:23 GMT

Post by stanmorek on May 14, 2009 21:41:23 GMT

According to information at hand,

Aspirational LU platform vertical heights from top of nosing to top of running rail are:
Sub-surface only: 950mm
Tube lines: 520mm
Compromise Tube/Sub-surface: 840mm
Shared LUL/NR: 915mm

Horizontal offset from nosing edge to running edge of rail:
Sub-surface only: 711mm
Tube lines: 610 (ballasted), 585 (concrete track bed)
Compromise Tube/Sub-surface: 711mm
Shared LUL/NR: 711mm

These dimensions are for straight uncanted track. Additional clearance needs to be calculated for effects of curvature and track cant. Effects due to curvature is a function of the car length, overhang from bogie centre, track radius of curvature, etc. The track assessment engineer should have a record of where the LU network does not quite meet the standard. For instance the Central line between Liverpool Street and White City have rail datum markers to keep tight control of the position of the track.

stanmorek
Guest

Loading gauge and structures, q?s May 15, 2009 23:19:03 GMT

Post by stanmorek on May 15, 2009 23:19:03 GMT

May 7, 2009 1:57:51 GMT dw54 said:

3) Is anyone able to help with the DLR platform height and third rail positioning and dimensions data? I assume with DLR very little height variability - correct?

Looking at a cross section of a Bank DLR platform archive drawing, platform surface is 1m above top of running rail and centreline of the track is 1.4m offset from the edge of nosing.

Here's a picture of an actual loading gauge, there's one visible at Golder's Green Depot too.

www.r.heron.btinternet.co.uk/images/historyother/loadgauge.jpg