I named the bridges as follows;
BRDGGIRD-grass.dat - Steel Girder Bridge Grass
BRDGGIRD-grass2.dat - Steel Girder Bridge Grass2
BRDGGIRD-rock1.dat - Steel Girder Bridge Rock1
BRDGGIRD-rock2.dat - Steel Girder Bridge Rock2
BRDGGIRD-sand.dat - Steel Girder Bridge Sand
BRDGGIRD-snow.dat - Steel Girder Bridge Snow
BRDGGIRD-snow2.dat - Steel Girder Bridge Snow2
BRDGSTAR-grass.dat - Steel Arch Bridge Grass
BRDGSTAR-grass2.dat - Steel Arch Bridge Grass2
BRDGSTAR-rock1.dat - Steel Arch Bridge Rock1
BRDGSTAR-rock2.dat - Steel Arch Bridge Rock2
BRDGSTAR-sand.dat - Steel Arch Bridge Sand
BRDGSTAR-snow.dat - Steel Arch Bridge Snow
BRDGSTAR-snow2.dat - Steel Arch Bridge Snow2
BRDGSUSP-grass.dat - Suspension Bridge Grass
BRDGSUSP-grass2.dat - Suspension Bridge Grass2
BRDGSUSP-rock1.dat - Suspension Bridge Rock1
BRDGSUSP-rock2.dat - Suspension Bridge Rock2
BRDGSUSP-sand.dat - Suspension Bridge Sand
BRDGSUSP-snow.dat - Suspension Bridge Snow
BRDGSUSP-snow2.dat - Suspension Bridge Snow2
BRDGWOOD-grass.dat - Wooden Bridge Grass
BRDGWOOD-grass2.dat - Wooden Bridge Grass2
BRDGWOOD-rock1.dat - Wooden Bridge Rock1
BRDGWOOD-rock2.dat - Wooden Bridge Rock2
BRDGWOOD-sand.dat - Wooden Bridge Sand
BRDGWOOD-snow.dat - Wooden Bridge Snow
BRDGWOOD-snow2.dat - Wooden Bridge Snow2
I named the filenames like this so the original doesn't need to be overwritten. Just copy which bridge you want to use to the objdata folder. The internal names were not changed and Locomotion will use these bridges instead of the default bridge. If you would rather overwrite the default bridge, just delete the name of the slope after the default bridge filename.
I also did not change any speeds or heights. When using the slopes to go 2 or more high, because some bridges have a roof, the second height and up will show the roof so ya won't wanna be trying to go more than one high with these just as the original earth slopes were like. You'll see what I mean if ya try it.
Anyway, they're done and I hope ya'll get some use out of these and thank you freepokie for the idea.