I oftentimes place two, 2 track, UK stone viaducts together, (ones with high sidewalls) and by using the hold+shift KB buttons (so tracks do not join like maga-knats), I lay independent tracks, a meter or so higher than the bridge ... the actual bridge tracks are not even used.
I disable a "snap to grid" tunnel, or bridge in it's config file, so it can be laid at any angle I want ... then I lay independent track slightly higher than the tunnel, or bridge, track.