They hardly ever build new steel truss bridge spans any more, as the overhead and side clearances are annoying, plus there is always the possibility that a derailment can collapse the bridge. Whatever is done will need to be okayed by the Army Corps of Engineers. Any steel trusses which are to be removed are still coated with lead-based paint,* and that will cause extra delay.
The most likely first-choice replacement would be pre-stressed concrete deck spans, but the spacing of the piers could be a problem. There is a practical length limit for concrete, and it may or may not exceed the length of the truss spans. Maybe there is someone on the Forum who could shed more light on this factor.
I wonder how far it is to the closest hotbox detector?
* Maybe not the current top coat, but probably a century worth, underneath the current coat.
