Yorky Dave has pre-empted me however it was the signalling that originated my thoughts, however it has very neatly taken me to lunch time.
The recent flurry of west London pics has had me thinking, principally about the North Acton description which I wasn't sure about, and I have now tracked down some info that firmly puts the following neg numbers at Old Oak Common West.
3229, 3235, 3236, 3240, 3241, 3242, 3243, 3244, 3245, 3247.
On the far left is the Up Wycombe home signals, two searchlight stop signals routeing to the Up Relief (16) and Up Main (8), above two searchlight distant signals for OOC East. To the left of them shunt aspects to the Up Siding (26) and Up Goods (23).
To the right is the Down Wycombe backing signal routeing to the Up Siding (12), Up Goods (33), No2 Down Goods (24), Up Relief (31), Down Relief (30).
Next Right is the Up Goods home signal, which by GWR practice should have a ringed arm but I think by then alterations relating to Old Oak Common PSB may well have been happening. This routed to the Up Siding (25), Up Goods (22), Up Relief (15), Up Main (9).
Next right in the distance is the Up Main home signal (2) with OOC East distant signal under it. Immediately next to it is the Up Relief home signal (14) with OOC East distant signal under it. At the top is a junction indicator for routeing Up Relief to Up Main (4).
The two signals shown with their backs to the photgrapher are the Down Relief starting signal (100) and Down main starting signal (106), both with Friars Junction Down distant signals beneath them.
The signal with a X is obviously a replacement for the Up Main home signal to provide an overlap for the junction fouling point.
The tracks moving right from the photographer are the Up Goods, No 2 Down Goods, Up & Down Relief, Up & Down Main, and behind the train No 1 Down Goods.
Martin