Great B&O website...amazing this bridge is still used...a record holder?
http://www.trainweb.org/oldmainline/
Nothing is more fairly distributed than common sense: no one thinks he needs more of it than he already has.
Proving that if you really want durability, build stone arches.
The Carrolton Viaduct is the oldest still-active railroad bridge, but the Starucca Viaduct and the ex-Pennsy arched viaducts in Pennsylvania are other good examples. Compared to steel brdges, they require little maintenance and no painting. Compared to wood -
Of course, the basic design dates back to the Romans - and a lot of their bridges are still in use, too.
Chuck (all of whose bridges are steel )
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