springborne

alternative spring-borne

1. not comparableSupported by (mechanical) springs.

   The motors are attached to the bogie frames so as to be fully springborne, and drive through quills and flexible couplings to the wheels.

   1952 September, “A Landmark in French Electrification”, in Railway Magazine, page 593

   1 more example

   The Pullman trains are the first B.R. diesel multiple-units to have fully springborne traction motors, which employ a Brown Boveri spring drive to the road wheels.

   1960 August, G. Freeman Allen, “The new diesel-electric luxury Pullman units of British Railways”, in Trains Illustrated, page 475