if you do try the bridge then do let me know how you found it. i seem to find people have mixed reviews of the bridge due to the area the bridge is in, but i really didnt find it too bad.
its gives a great opportunity to photograph trains approaching and departing from the north of the station as its quite straight and unobstructed on the approach.
if i get chance i will post my class 56 photo onto flickr and post the link for you on here