We need to be reminded that there were only 4 Crescent Limited Engines. The four operated only on the Eastern lines between Atlanta and Washington. Two northbound and two southbound with the engine change both directions at Spencer. These 4 engines were shopped out of Pegram Atlanta and Spencer in North Carolina.
There were only 3 Queen & Crescent Engines. They operated from Chatanooga to Meridian and only occasionally ventured north of Chatanooga. These 3 engines were primarily shopped out of Finley in Birmingham.
These 7 engines, all "Harrison Engines", were the stars of the Southern Railway Advertisement and Promotion Department and targeted by photographers for a period of time after 1926 until the very early 1930s. The Crescent Limited engines modeled---1393,1396 and Harrison 1403 have also been a prime target for production by the O-gauge Importers while the Queen & Crescent versions have been generally ignored. Ps-4 1401 as produced in scale by Williams in brass and MTH in diecast were not Crescent Limited engines. [K-line also produced a nice semi-scale version of the Ps-4].
These 7 engines were each uniquely equipped as regards their details and appliances depending on the shop that maintained them. For example Spencer was noted for its long "Fingernail Visor" on the headlight while Pegram had a shorter flatter visor. The Queen & Crescent engines wore no visor until changed at Spencer in later years. Pegram Shops liked to operate its bells with rods while Spencer and others used a cord. Some had their whistle tilted forward a 45 degrees some at 25 degrees and so on and so forth.
Most of the models are painted and trimmed for what I call "marketability". That includes the "red roof syndrome" which if you believe the historical records, film and microfilm purchased and documented by the SRHA---is incorrect! In addition, according to "Spotters Guides", much the green trim on models is incorrect, for example marker lights were black, Elesco Feedwater Heaters and most pilots were painted black. And, as Larry Neal has noted, after the early 1930s the "Limited" decoration on engines and railcars was gradually eliminated as the 7 engines were shoped for routine maintenance.
WWII brought about a massive rehab and upgrade program in the Shops of Southern steam much of which had been rusting on "dead tracks" during the Great Depression of the '30s. Southern didn't have the capital to buy more diesels in 1940-41 and then in 1942 the War Department severely rationed new engine purchases in favor of Tanks and Planes.
So I guess my point is that, although the Importers have taken liberties with their decoration of the modeled Limited Engines, they are generally very attractive. And, perhaps there is some justification in that the real 1393, 1396 and 1403 were all individually different to some degree in their details and decoration.
It seems to me that, unless a person doesn't own one at all, $$ and a personal desire for the Legacy innards and new operating system is the key element as to whether one buys a new Southern Crescent Limited Ps-4. Not the slightly different decoration or minor change in details reaching from the Williams Ps-4 in 1990 until the Lionel in 2012. But of course I am an admitted, obsolete old phart!