For instance, at the turn of the 19th century, Sacramento was a railroad town and a swing bridge carrying the Sacramento Northern (SN) Railroad was built at this site in 1912. The Tower Bridge replaced the swing bridge in the early 1930s but continued to carry the SNRR (along with cars and pedestrians) until 1962.
In this photo you can see the cables attached to the lift span (and counterweights). The total bridge length is 737 ft, the roadway is 52 ft wide, the lift span is 209 ft long, and the towers are 160 ft tall (and supported by 50 ft deep caissons).
Movable Bridges - Tower Bridge (2) by Mark Yashinsky is licensed under a Creative Commons Attribution-NonCommercial-ShareAlike 3.0 United States License.