Hello Kurt! An 1120 Motor is smooth on the bottom with Brass colored pickup rollers & a 1050 Motor has ridges on the bottom with sintered rollers & this is the difference between the two.(other than the reverse lever on the 1120) Take Care.
The 1110 and the 1120 motors look similar, but the 1120 has magnetraction, and the 1110 does not. These seem to look similar on the outside, but I want the Magnetraction.
Kurt- Just take a screwdriver or use a piece of Track at a Trainshow to determine if a motor has Magne-Traction. If a motor has Magne-Traction the Track or Screwdriver will be attracted to the Drivewheels. Take Care.