Problems arising from the use of hydraulic fluids in diesel railcar fluid couplings (TM-TRIB-2)

In early 1960 there was a spate of fires on DMU underframes due to the bursting of the fluid flywheels which resulted in the coupling fluid being sprayed on to the hot exhaust system. At this time the flywheels were filled with the engine lubricating oil, namely Shell RD30/1 or...