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Accurate maps of where the SSR lines sit under the streets?

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ijmad

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I was wondering if there are any detailed maps showing the paths of the cut and cover tunnels on the subsurface railway under the various streets they're underneath, and where junctions are and so on.

Online would be great but if there's a book I might be interested in that too.

Google Maps is incredibly inaccurate because it's just showing approximate curves between the stations, and carte.metro is no help because it's only showing the flow of the lines, not where they are on a street map.

I suppose there might be a way to superimpose one on to the other if someone's been really clever but I rather suspect carte.metro may not be useful for this purpose as it's more about showing relative position than actual scale.
 
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edwin_m

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This was the subject of a RAIB enquiry when piling for a new building entered a tunnel on the Northern City line. Although this is a NR route, comments were made about the same situation happening on the Underground including:
https://assets.publishing.service.g...0f0b60241000157/R032014_140213_Old_Street.pdf
92 Ordnance Survey’s policy is to exclude the route of most tunnels used by underground railway systems on its mapping. However, there is no indication on Ordnance Survey maps, or in British Standard 5930:1999+A2:2010 (BS 5930) ‘Code of practice for site investigations’, that some railway tunnels are omitted (paragraph 72).

93 Accurate alignment information is not publicly available for underground railways in central London. In the absence of this information, some maps show an assumed alignment for the tunnels. For example, Google Maps (figure 22) shows a stylised alignment for the London Underground Northern Line which is significantly different from the actual alignment (figure 23). The lack of accurate information creates a risk of future development affecting existing tunnels due to misinterpretation of where the tunnels are located. For example, properties at locations A, B and C (figures 22 and 23) are much closer to existing tunnels than suggested by Google Maps.
 

rebmcr

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openstreetmap.org has what you desire, even including platform positions.
 

krus_aragon

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Even though this thread is in the London Underground forum, I was wondering if "SSR" stood for "strategic steam reserve" ...
 

Rogmi

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The TfL site has the Property Asset Register Public Web Map which will show you the details you want:
https://tfl.maps.arcgis.com/apps/webappviewer/index.html?id=5129c766255941d3be16a6828faa8f18

Overlaid on a scrollable detailed Ordnance Survey(?) map, the lines are shown by their colour. It is clearer to see the path of the tunnels if all Layers are turned on as then the boundary of the tunnels is shown in grey with a dotted outline (the LUL zone of influence). Sometimes the actual tunnels are shown in a dark teal colour, which the Legend colour denotes as London Underground Limited Stratum.

Click on the Legend icon on the map to show all colours
Click on the Layers icon to show the layers (all are on by default)

The overlay is accurate and also shows some disused tunnels that are still LU property – such as the C&SLRly between Borough and King William St and the C&SLRly Charing Cross loop

Geographically, the Carto Metro map is generally very accurate, other than minor differences where a little artistic licence may have been used for clarity where there are several tracks together (e.g station). However, as mentioned, this doesn’t help when trying to accurately follow the lines at street level
 

si404

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Shush, the people aren't supposed to know that the SSR is kept within the Kennington loop. :lol:
They use that for tube stock (plus the tunnels are a bit small) - nice diversion from the real place it's kept (Cromwell Curve)!
 

etr221

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Vintage large scale OS maps (60 or 25 inch to mile) showed the sub-surface tunnels, which won't have moved, though the roads above might have changed, these are online at the NLS - see e.g.https://maps.nls.uk/geo/explore/index.cfm#zoom=17&lat=51.5119&lon=-0.1035&layers=163&b=8
Zoom and change options as desired.

Or a set of TfL/LU maps showing lines as an overlay on OS 1:50k maps were produced as pdfs in response to a FOI request https://www.whatdotheyknow.com/request/lul_route_maps#outgoing-402712 - but these are now over 10 years old.
 
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