Allied full cushion trucks were designed to roll high-speed freight cars with passenger car smoothness. The unique combination of soft-acting coil springs and swing hangers enabled them to effectively dissipate shock, producing greatly improved performance at all speeds and reducing the costs associated with damaged freight. Introduced in the early 1940s, they were ultimately used by sixteen different railroads. After WWII, they were gradually removed from service due to their tendency to derail.
At present, Micro-Trains makes the only Allied Full Cushion truck in N scale -
Micro-Trains - wheelbase 9.8mm, frame Width 15.65mm, wheel size 33", axle length 13.7mm