got this in a private message today; I'm thinking roadfro will forgive me for posting it publicly so that other people can give more info ...
Forgiven!
okay, I heard about US-140 from AARoads's own Andy Field verbally, and it was confirmed by someone else I talked to, a highway sign collector, who mentioned that NV never made any US-140 shields but they sure wanted to...
Thinking more about this from the Nevada perspective. . . .
I've discovered in the last few months that state highway numbers in Nevada used to be described legislatively. Each route was described with a separate entry in the state's highway laws and also later in what became the Nevada Revised Statutes. For longer routes, this was a general description of the route via certain towns or locales; for urban routes, it listed fairly specifically the streets the state highway followed. Legislative definitions of routes ceased after the highway renumbering in 1976.
Something to note from this is that routes were assigned more or less chronologically (although one or two numbers were never assigned, and some numbers were inexplicably reassigned). Through this method, state route numbers never made it higher than 93. However, NV 140 was legislated
before the renumbering. This shows that there was concerted effort to at least number the highway as 140 in Nevada, because there were ~40-50 numbers skipped when 140 was assigned.
Incidentally, Nevada's legislative numbers were given with no regard for US highways (or the later Interstates), and only state routes were mentioned in the laws. The highway signed US 40 was legislatively SR 1; US 91 was SR 6; US 95 was SR 8, part of SR 1, SR 1A, part of SR 3, and SR 5; and so forth. I'm not sure as to what extent the state highways were cosigned with US routes, though. It is interesting to note that had US 140 been signed, it would be the only case where the legislative route and the US route were the same number.
It is also interesting to note that SR 140 was one of only three routes to retain its pre-1976 number (the others being 28 and 88). In this case, it is especially notable because NDOT planned to change it to SR 291 but never did.
All this to say that I'm finding more validity in reports of the proposed "US 140"/Winnemucca to the Sea Highway. . .