You must have sighted a standard gage Thomas. The 3’ gage one left the Colorado Railroad Museum on October 3rd, and arrived at the Strasburg Rail Road for its annual maintenance and winter storage on October 5th. It is in the shop right now.
It is interesting to note that RGS #20 left the Colorado Railroad Museum on August 8th (?), and arrived at the Strasburg Rail Road on October 7th (!). Different trucking company.
Photo by Mark Andrews