Scratch building detailed bridge track

[Engfanuk]

The railroad bridge I see in those pics is a ballasted deck bridge and that would use regular track and ties.If your planning on doing a open deck bridge then you need bridge track with the closely spaced ties.I'm guessing this bridge was updated since in some of the pics you can see the raised sides of a concrete trough holding the ballast for the track in place.

Yes I think it has been updated.