October 18, 1982.  Keddie, California.

Still surviving!  On the eve of the WP-UP merger, worn and tired looking 504 is still hauling the freight.  At this late date, only 3 pieces of revenue equipment still wore TS markings, all were 501-series boxcars (one was the 507, the third number is unknown).  All other surviving 501s had been renumber into WP series 36026-36050.

photo by Thom Anderson

501-525 series XM Boxcars

Tidewater Southern Railway