OK, I think I'll call time on this one.
The station was quite clearly Bristol Temple Meads. The lines running east from the station split to form the lines London via Box (diverging to the right and running south east), and up to Filton (diverging left at the triangle and running north). The third side of the triangle (the right side) is the little-used Rhubarb Loop, so called because of the pub situated immediately next to it called the Rhubarb Tavern. On the right-hand side of the picture you can see the eastern entrance to St. Philip's Marsh depot branching away to the south. The depot itself is part-visible in the bottom-right. The line running south out of Temple Meads is, of course, the line to Exeter and beyond.
If you look closely, you can see Brunel's original train shed to the left of the current station. One wonders why he opted to terminate the line here, when the board of directors of the GWR were in talks with the Bristol and Exeter Railway for a merger to Exeter.
The following people submitted an answer:
Sam
scrxisi
moley
greatkingrat
mullardo
Starkey
jbom
Garion
Going Underground
uefacup81
tangy
All got it right, except for Going Underground who for some strange reason decided it was Paddington. I'd love to see his reasoning for that.
I'll post up another picture at some point later in the week if you want another go at this.
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