Consider this… let’s say the NMRA had an RP to state the era/time period of a car on the outside of the packaging. What would MTH do when it came to their Western Maryland red, white, and black striped (circus scheme) 33,000 gallon tank car? Or the Chessie version? They would have to put FICTITIOUS on the box…and that, IMHO, would detract sales. If being accurate is very important to you, you will have to do your homework so that you are educated enough to choose what is appropriate for you. Heck, even Overland has released brass covered hoppers in the past with road numbers that never existed. You would think with all the money you pay for a brass car and a factory paint job, the road number would be accurate. You can’t always assume so.
Too many cars transend their 'Era’s" with upfrades, plus too many 'beginners would pass up a car just because of the so called "era - or possibly any other disclaimers
“This coupler may not couple on 18” curves"
“This engine may stall on insulated frogs”
" This product may be injurious to your wallet"
HOW ABOUT “This pair of pants may not fit as you get older” ??
Certain products are made for certain Era’s - MDC’s ‘Old Time’ 36’ cars.They are great cars. and How many get sold? Today’s ‘Modern Era’ will eventually become obsolescent…
Part of a hobby is doing your homework - if one has enough interest