28's tender has almost as interesting a history as the locomotive.
The tender tank behind 28 is a tank from a WW2 army S-160 2-8-0 that was placed on the tender frame that the engine was delivered with from Temple Lumber Co.
When the engine was built, like all Pershing types, it was equipped with a standard Baldwin straight sided tender. The engine kept this tender for about 20 years until sent from Alabama to Montana about 1937 to work on the Fort Peck dam project. There the engine was equipped with a different tender.
Photos of this tender show up behind the engine at Camp Claiborne, where it went next. Sometime during the stay at Camp Claiborne, photos show that the engine swapped tender tanks (and possibly the entire tender) with the other locomotive that came from Fort Peck, which was former Washington, Idaho and Montana #22.
At any rate, when the engine went to the Tremont and Gulf, after WW2, the tank from WI&M #22 was on a tender frame from Great Northern 4-6-0 #932. The tank on this frame was replaced by an extra S-160 tank that came to TSR when the engine was placed back in service.