ok not exactly the same as trains and subways but, down the street from me is an old bridge built in the '50's or something which county engineers decided needs to be replaced.
it's a very small bridge sitting over the back end of a body of water leading to an adjacent river, it's a very low bridge and about 130' overall.
the cost is almost $5 million and will take almost 2 years to complete. for the majority of the destruction and destruction the bridge will be out of commission, not useable. Now for the kicker, it will be 20' shorter in overall length. No one from the building dept has returned my email asking how the bridge can be 20' shorter when completed.
I'll take a guess. They will extend and raise the respective shorelines at the roadway approach to the bridge so the completed bridge will be higher and ultimately shorter than the original.