A Chiltern Railways Mk 3 Driving Van Trailer is to be the test vehicle for a new powertrain demonstrator for self-powered rail vehicles, as part of a wider competition funded by the RSSB (Rail Safety and Standards Board) and Artemis Intelligent Power.
The vehicle will use a JDB diesel engine powering an E-dyn 96 Digital Displacement hydraulic pump linked to axlemounted digital displacement motors on one of the vehicle’s’ bogies.
The pump is said to respond rapidly to changes in load demand, with pressurised idle losses 90% lower than with conventional variable displacement pumps. It is due to be tested over three months from December 2017.
Onboard energy storage will be provided in the form of hydraulic accumulators which store energy during braking for reuse during acceleration. This reserve can then be used to supplement engine power.
The RSSB says the technology could be applied to nonelectrified routes. It could also be combined with a lowerpower diesel engine than would normally be required to reduce emissions and fuel consumption.