Track fastener. Pocinho, Portugal (on the Douro River). The oldest track used spikes, as a little mini-museum containing a handcar shows, and more recently these screws held rail in place. Modern track uses a range of sleeprs and fasteners. [A pile of these track screws.]
Photograph and text by George P. Landow. [You may use this image for any noncommercial purpose as long as you credit the photographer and this URL].
