Railroad spikes

[bufaloeletric]

can anyone tell me anything about the marks on this spike? Appears to be the letters CY or GY on the head, along with a diamond shape directly below. Spike is 7 1/4 inches long and 1/2 by 1/2 inch square along the shaft. Found in southwest virginia. thanks.

 

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[bufaloeletric]

After doing some research ive found out that a Cu stamped on the head means that it contains some amount of copper. the diamond symbol still eludes me tho.

 

[ELITE]

there are tons and tons of railroad spikes, it could mean anything