Yes we are drifting WAY off topic, but this strikes a chord with my heart strings... I grew up during the MPC era and lusted after these in the catalogs. (Am I the only one who thinks that Lionel should do a "MPC Celebration Series"!?) The MPC-era 4-4-2 uses a modified 2036 boiler casting, which itself was a modified 2026, which was derived from the comparatively spartan and baby-faced 1666 produced from 1938-47.
So it's not really a scale model of anything. The 1666 supposedly had the lines of a NYC light Pacific. But IMO the details added around 1950 (bulky sand dome, Viloco sanders, air line coolers on the pilot deck) were inspired by the last of steam: the C&O K-4 Kanawha, or P&LE A-2. Take a moment to visualize what a postwar 2018 would look like with a lowered headlight and flying number boards [C&O]. Or, with a twin-sealed-beam headlight mounted high on a flat Selkirk front end in olive drab green paint! [P&LE A-2]. There are other influences too... The "sports model" cab definitely isn't NYC / Nickel Plate. Personally, it calls to mind L&N's "Big Emma" 2-8-4s, which were among the last steam locos Baldwin built. Even more details, such as a power reverse gear, were added by MPC in 1973 when they moved the marker lights to the boiler front (a great feature!) When it comes to "traditional" O gauge, you can't put too much emphasis on the wheel arrangement. Remember, in real life a 4-4-2 would pull as much as a 2-8-4 as long as it still had 293,000 lbs on the drivers!
Perhaps Todd Wagner could tell us what became of the tooling. After the last Girls Train replica (circa 2006?) it hasn't resurfaced, and I've nearly given up hope of a LC+ version. Pat doesn't know it yet. But when he retires I'm gonna ask him to fit a Pittman 8692 motor and NWSL gearbox in one of these 4-4-2s . Because sometimes, you just need a smooth 4 mph creep in that handy O27 size!