That's good question. I don't know about those chips. They were not on Larry Hollibaugh's website, and his chip list for the Reno area is extensive.

I did find that there were $7 and $10 Silver Strikes with the Plantation Station name (and a pic of a train on them).

Perhaps the NGCB approved such chips but they were never put into play prior to the time it changed names to Rail City. ???