These springs made up part of the bogies and were designed to improve ride comfort by absorbing vibration and lessening the impact of centrifugal forces through curves.
The effect of the springs also helped minimise rail abrasion and wear and tear on the tracks. These shock absorbers were used on the U-boat cars, so known because of the target plates identifier starting with a U.
Bogies is part of the Eveleigh Paint Shop series.