Golders Green appears to be an odd one! According to Carto Metro there's sidings 1-33 in the depot, and roads 21-27 at the station, including sidings that are either side of the depot entrance
Actually Golders Green makes sense when looked at from an operating point of view as Golders Green is in effect two totally separate areas - main line (passenger) and depot. 33 road is normally referred to as "the depot shunting neck" and is under the control of the depot. All moves in and out of 33 road are all self-contained within the depot and have no effect on the main (passenger) side.
21 – 23 road are the platform roads
24 – 26 roads are sidings that are used for stabling or reversing, usually when the service is disrupted
27 road is the shunting neck that trains to from the platforms use when going to / from the depot. All these roads are on the passenger side and come under the control of the signaller. 27 road is als under the control of the signaller, permission given from the depot if it is required for a train in the neck to go to depot.
Edgware
1 – 3 platform roads
4 – 11 depot sidings. There used to be further sidings (12 - 16) on the other side of the main line, of which only 16 remains (now no longer physically connected and due for removal).
There were also two sidings (17 and 18)in what is now the waste ground the other side of the old main line (shown dotted on Carto Metro). These were to form part of the main line to Burnt Oak under the proposed extension north of Edgware.
There were also two shunting necks at the south end of the depot (54 and 55), since swallowed up by the expansion of the depot and additional sidings at the south end for the introduction of 95 stock on the line. Additional sidings 35 – 42 were added.
High Barnet
The platforms are 21 – 23, with the sidings 24 – 31 and the shunting neck 32.
In preparation for the temporary 95 stock storage, an extra shunting neck (33) was added, and three extra sidings (34 – 36) were added in the gap between platform 3 and 24 sidings.
Morden
1 – 34 are depot sidings
26 was removed and 27 road became the Paint Road for the 95 stock paint building that spans the end
41 – 43 are the platforms
44 and 45 are the depot approach roads
54 and 55 roads are shunting necks withing the wash roads which also double up as shunting necks for depot moves.
Some places may have gaps in the road / siding numbering due to layout changes over the years, especially where there used to be goods traffic and the sidings later disappeared. East Finchley and Finchley Central are good examples of this.
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I missed Highgate out!
Highgate depot
cira1950
21 24: Wellington sidings
25 23: Highgate depot sidings
37 road: single line depot approach road to the north end of the depot off the SB main line
1 4: Highgate woods sidings
Highgate sidings (no longer called depot!)
Today
1 9: depot sidings
10: test track
11: Engineers siding
37 road: single line depot approach road to the north end of the depot
plus, not numbered:
Engineers siding
Tamping spur
East Finchley
circa 1950
21 23: platform roads
24: siding
26: access road to goods yard
28 32: Goods yard sidings
There were a lot of changes to the East Finchley area with the coming of the Northern line extension. This included various temporary layouts, such as crossovers south of the station between the main line and underground lines allowing trains from middle platform 3 to go into the tunnel and NB main line trains to go to platform 1 (it would have been useful if they were still there today!). Also todays southbound road used as a siding (next to the existing siding) and 26 road being used as the main SB line.
