That would be a "trestle"
Wilsonville railroad bridge was created in 1975.
Glasgow Railroad Bridge was created in 1879.
Louisiana Railroad Bridge was created in 1873.
Struve Railroad Bridge was created in 1870.
Anacostia Railroad Bridge was created in 1872.
Fairmont Railroad Bridge was created in 1912.
Beverly Railroad Bridge was created in 1909.
Columbia Railroad Bridge was created in 1920.
Railroad Bridge Company ended in 1866.
Railroad Bridge Company was created in 1853.
New Railroad Bridge was created in 1979.
Trestle is a word for railroad bridge.