Source: Trinity County Historical Society. https://www.texasescapes.com/TexasBridges/Trinity-County-Trinity-River-Railroad-Swing-Bridge.htm. Additional information: Cheryl Spencer, “Riverside’s Swinging Railroad Bridge,” Episode 31: March. 26, 2008, in Sam Houston’s Stomping Grounds, adapted by permission of the Walker County Historical Commission from: Riverside’s Swinging Railroad Bridge (1986) in Walker County Historical Commission (Ed.), Walker County, Texas: A History.