That model was a Berkshire, the trailing truck has been replaced with a brass one with a booster from PSC.
The model is the Bachmann NKP/PM version.
After doing much research on the DT&I 800, all the Lima super power Berks, and a number of the heaviest Mikados, it turns out that the NKP/PM Berks could just have easily been Mikados on a road with heavy trackage that could stand a little higher axle load.
Roads like the C&O, PRR and others could have easily handled such a loco. The GN O-8 Mikados had as much power, larger fireboxes and much higher axle loadings than the NKP/PM or C&O 2-8-4’s. And, they had 69" drivers just like those 2-8-4’s.
The DT&I 800 series Mikes look like the Berks, because they where designed and built at the same time Lima was building those Berks, and DT&I did not want the larger drivers or heavier loco. The DT&I 800’s were in fact, super power Mikados, little baby brothers to the Berks with all the same features and refinements less the larger drivers and firebox, and the same looks, outside bearing lead truck, same boiler profile, same tender design, similar domes and placements, same feadwater heater, same valve gear, etc.
http://www.rr-fallenflags.org/dti/dti-s800.jpg
http://www.rr-fallenflags.org/dti/dti-s804lba.jpg
So, on my freelanced ATLANTIC CENTRAL, we did order such a Mikado from Lima. Just like a NKP Berk but with a single axle booster trailing truck, placing more weight on the drivers and increasing TE even more. I am in the process of building four of them. There will be two pairs with slight differences to repres