Maybe check the route in CM for missing assets? The bridge is there in my copy.
Yes, the bridge (<kuid2:124017:25029:2> Plate Girder Bridge, bendy) has "Faulty" status:
; <kuid2:124017:25029:2> Validating <kuid2:124017:25029:2>
! <kuid2:124017:25029:2> VE48: This asset uses an obsolete trainz-build number. Trainz-build numbers below 3.5 are no longer supported.
- <kuid2:124017:25029:2> VE65: The *.texture.txt file is missing for texture resource 'edges.texture'.
- <kuid2:124017:25029:2> VE65: The *.texture.txt file is missing for texture resource 'misc-steel.texture'.
- <kuid2:124017:25029:2> VE65: The *.texture.txt file is missing for texture resource 'plategirder.texture'.
- <kuid2:124017:25029:2> VE65: The *.texture.txt file is missing for texture resource 'rail.texture'.
- <kuid2:124017:25029:2> VE65: The *.texture.txt file is missing for texture resource 'ribs.texture'.
- <kuid2:124017:25029:2> VE65: The *.texture.txt file is missing for texture resource 'tie-end.texture'.
- <kuid2:124017:25029:2> VE65: The *.texture.txt file is missing for texture resource 'tie-side.texture'.
- <kuid2:124017:25029:2> VE65: The *.texture.txt file is missing for texture resource 'tie-top.texture'.
Fortunately this time I could fix it by "revert to original"...