Yes, I have often said the SD45 was the best loco they have ever made, I only have one, but it was of the last production, high nose Norfolk Southern, big enough for me!
It was also the favorite of George Schreyer, the DCC and LS pioneer who has that great website that has helped so many over the years.
A small correction for Aria31: Kader is the company that owns and has ALWAYS owned the tooling. Aristo NEVER owned the tooling, but had the tooling made at a lower cost by not owning it. This was known for many years.
Kader also bought Sanda Kan, the company that USA Trains, Aristo and many others had making their trains.
Kader also OWNS Bachmann completely.
So, it seems highly unlikely Kader would redesign any of the Aristo stuff, and the motor blocks have plenty of room inside for smaller motors, but again Aristo products always had standard sized Mabuchi motors.
The only thing I anticipate changing might be wiring, elimination of incandescent bulbs and maybe some of the intermediate circuit boards.
But time will tell.
Greg