Railroad tie - Wikipedia

Rail fastening system - Wikipedia

File:Railroad cars with stacks of railroad ties in railyard, at a railroad tie treating plant in Somervell, Texas, March, 1909 (INDOCC 1619).jpg - Wikimedia Commons

Rails & Ties - Wikipedia

File:PanamaRR Rail Spike Tie.jpg - Wikipedia

History of rail transportation in the United States - Wikipedia

Concrete sleeper - Wikipedia

Vance Creek Viaduct – Shelton, Washington - Atlas Obscura

Fishplate - Wikipedia

How to Build a Railroad Tie Retaining Wall: 8 Steps

Lehigh Line (Norfolk Southern) - Wikipedia

Report: Mexico's President to Require Private Freight Companies to Offer Passenger Service (UPDATED, 11/21) - Railway Age

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File:1920s Cabin Built of Railroad Ties in The Mesquite Bosque at the DNR.png - Wikipedia

Railroad tie

File:Destroying CW railroads.jpg - Wikimedia Commons