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I finally caught up with train 405 (Extra 3530 West) as it was slowing to go into the siding at Ardmore. Train 405 originated at Ark City with traffic off train 305 for Galveston.
About an hour later Amtrak's Texas Chief came through with engine 505 on the point. The date is June 10, 1978. Pictures above are on disk 85. Steve was able to grab another shot of train symbol 305 as it came through Ardmore below.