But one very unique double decker bridge was along the Allegheny River in Foxburg Armstrong County.
I encountered it in the summer of 1974 while on a Boot & Paddle canoe trip from Boyscout camp in Tionesta to Pittsburgh. a total of 150 miles of paddling I have done it twice as a teen.
It was foggy morning when we came across this bridge when I noticed a cars headlights going one way when all of a sudden a train was coming over the top the opposite direction
So what was going on not much it seems as a way to save money engineers had combined 2 functions into one bridge . Autos ran inside the cage part of the bridge and trains ran on top. a most unusual arrangement as usually trains and or trolleys in the case of the Smithfield Street Bridge ran side by side.
Unfortunately the bridge which was built in 1921 was torn down several years ago and what pictures are available are not very representative of this unique engineered marvel now gone .