NOTE: Lightweight sleeper Ahead was created in the summertime of 1936 as the main Pullman sleeping car or truck utilizing the "alloy-metal truss frame" technique. This car was an addition to the 1st (heavyweight) Super Chief consist in November 1936 (soon after early Diesel units one-A, one-B and leased one-C [the "1 Spot Twins"] had proved their s