HO Scale Donor Mechanism: NWSL Stanton Drive 6' 6" Wheelbase 33" Drivers
S Scale Donor Mechanism: NWSL Stanton Drive 8' 0" Wheelbase 36" Drivers 
These ALW 28-ton frames are the same used for the ALW 28-Ton boxcabs and B-units. Designed to fit right over the correct NWSL Stanton Drives, these are great bases for freelance locomotives in every scale! HO frame includes coupler mounting pegs.