One unit, M55997, was converted as a test bed for hydrostatic drive in 1980, was renumbered RDB 975385, and named Laboratory 9 ‘Hydra’. It was fitted hydrostatic transmission having the normal Leyland 680 six cylinder engine driving two Rexroth Hydramatic axial piston pumps. Each pump supplied fluid to a Volvo fixed displacement compact axle-end motor which drove the axle directly. The maximum system pressure was in the order of . This arrangement was only fitted to one bogie, the other one retaining its normal drive but with the cardan shaft disconnected.
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