I posted some of my Batavia, NY pictures in 2008 on my webshots site.
I have included some information in the captions as to the location of the photo and the date it was taken.
The NYC "new" ROW was built starting in 1951 and ending in 1957.
The line officially opened on April 2, 1957.
The "old" line running through downtown officially had its last train on April 12, 1957.
http://community.webshots.com/user/railfanbrplv
As was mentioned previously...the NYC relocation was a grade elimination project.
I researched the relocation in 1998 and read many Batavia Daily News articles about severe train accidents in the Batavia City limits. The NYC original mainline crossed most streets at grade. (This was not uncommon of the original NYC Mainline as it ran in downtown Rochester [until the 1890's] and downtown Syracuse [until the 1930's]).
To find the abutments of the original NYC Mainline bridge over the Tonawanda creek, walk East from NY-98 along the NYC Peanut (still existing track). Once you reach the creek, look South and you will see the abutments.
Thanks.
WNYRailfan