File:PanamaRR Rail Spike Tie.jpg - Wikipedia

Canadian Pacific Spike Driving Competition 2013

When did the USA start building railroads from coast to coast? - Quora

File:Tie handler, spike puller, CSX, Waycross.JPG - Wikipedia

Golden spike - Wikipedia

Who built the first railroads in the US? - Quora

Panama Canal Railway - Wikipedia

Panama Canal Railway - Wikipedia

Paul Santos Photo: Canadian Pacific stenciled

Rail fastening system - Wikipedia

Victor Baseplate Fastening System