Hi Ian,
This is a really interesting project, and I feel that this end of Toton is always neglected.
There was an awful lot going on at this end, including the WRD, and I am sure there was a small set of fuel loding/discharge siding running into what is now ASDA's car park. (which IIRC were to the right and below the front of the peak in your picture.)
I haven't seen may pictures of trains actually crossing the bridge, and I have walked over it many times in the past (you can't now as they have put pallisade fencing up).
This bridge would make a really good addition to Grimleys' Boxenby monster!
If anyone has any further pics they can add of this area it would be really informative.
Keep supplying us with updates!
Regards
Trev