Hi Kallaroonian.
As a product of Hatfield (Hurts), I am looking forward to seeing this project grow. I have never delved into the history of Hatfield station even though I lived there until I was 25.
It depends on your timescale but the Wrestlers bridge collapsed in 1966 if this site is to be believed.
http://www.sabre-roa...restlers_bridge
It was replaced by a footbridge which is still there.
The St Albans line did curve off before the Wrestlers bridge, just after passing under what I´ve always called the Red Lion bridge.
There are a couple of pictures of the North end of the station during the sixties in the Middleton book, Branchline from Dunstable to Hatfield.