Progress in oleo-pneumatic secondary vertical suspension development (up to September 1972) (IM-DA-174)

In order to meet the exacting secondary vertical suspension requirements of A.P.T., the self-levelling oleo-pneumatic system demands a perhaps unique combination of low-friction characteristics together with a good level of dependability allowing trouble-free operation over periods between overhaul of the order attained with other B.R, passenger stock. A further...