As triggy posted, Lionel did make 14" (14 3/8") straight sections with 072 tie spacing during the postwar years and they command a premium.
Prewar, not postwar -- only 072 curves after the war, and they were catalogued in only a few years (1950 and 1954-7, IIRC); 16 sections of curved track came in a box, listed as number 760. Prewar, single sections (curved and straight) were cataloged, as well as the 760 box. There was a pretty complete line of 072 track, including the 711 (remote control) and 721 (manual) switches, as well as a 90 degree crossing specifically for use with 072 track. But there was no 14-inch uncoupling section; you had to work regular RCSs into your plan.