CP Spike from Sacramento

From: KyleKWyatt@gmail.com

[Here] are photos of a CP spike (or the mortal remains of it) found in Old Sacramento during the 1970s excavation of the CP Passenger Station site.  It appears to be wrought iron.  Does anyone have an idea when they switched to bar iron for making spikes?  

—Kyle

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CP Spike from Sacramento.
Courtesy Kyle Wyatt, CSRM.