Thanks, Ed. That helps. I'd like to get enough of the correct UPS trailers to do an unreasonable facsimile of the EL's CX-99 and/or 2/NY100. This should help me and any other interested modelers build this train.
Found this on Train Orders I remember it coming up:
Red or yellow stripes are good until about 1992, after that, UPS left off the stripes when the trailers were shopped/overhauled. Red Horizontal is the earliest scheme - 70s and up, but I'd say that they would look strange on a 1990s-era intermodal train (ATSF SuperFleet, etc). Why red or yellow stripes? 1) On the prototype, red = no pintle hook in back 2) Yellow = pintle hook in back for those states that didn't mind double 40' trailers rolling within their state. All styles were found in TOFC service in large numbers.
Rio Grande. The Action Road - Focus 1977-1983
Heavy red was introduced in 1974-1975, and signified that the trailers were permitted to be used on flatcars.
In the late 70's, the narrow red replaced the above. The yellow was also introduced about then, and signified that the trailer had a pintel hook. And was approved for piggyback.
These colors/stripes disappeared late '80's--early '90's.
While I have an interest in UPS, it's not HUGE. So someone who knows more may well pipe up. But it's a start.
Ed
http://www.walthers.com/exec/productinfo/744-4014447
I was wondering when UPS trailers used yellow, heavy red, narrow red, and no stripes so that I can try to get the right trailers when they come out. (See link above for Trainworx' planned trailers.) Thanks for your help.