If you went up MD 30 into Hanover, PA, you passed not far from my house.
You don’t say what style of bridge this is for, but since I hand lay all my track, I find it very easy to make my own wood bridge ties from 8 x 8" (approx 3/32 in HO ) wood stock. I use diluted India Ink and 70% Isopropyl Alcohol to stain the ties. Rail is held in place using pliobond under the rail. Rail is heat treated with a hot soldering iron as it is gauged on the bridge. Here is a project I am working on now (Still needs the Guard Rails after the bridge is placed on the layout).
73