Placed after the last bridge(set) in the newgrf list this grf will modify the base price and top speed for all bridges. I choose to modify the top speed to get a better spread and then let the price be directly related to the top speed.
This means that the following bridges are available:
Wooden - Top: 40 mph
Concrete - Top: 60 mph
Girder, steel - Top: 80 mph
Suspension, concrete - Top: 180 mph
Suspension, steel - Top: 120 mph
Suspension, steel - Top: 80 mph
Cantilever, steel - Top: 100 mph
Cantilever, steel - Top: 130 mph
Cantilever, steel - Top: 150 mph
Girder, steel - Top: 160 mph
Tubular, steel - Top: 200 mph
Furthermore some building costs are affected too (compared to the base price):
Raise bridge building cost (x64)
Raise tunnel building cost (x64)
Raise terraforming cost (x32)