St. Simon Posted September 19, 2018 Share Posted September 19, 2018 Hi, Just saw this on bucks free press, but a better article is here: https://www.ft.com/content/4f7d9fd8-ba98-11e8-8274-55b72926558f From a quick read, it seems it is another bi-mode, but with a different operational concept, in that the batteries were to be used only to reduce fuel consumption and to reduce noise and fumes on approach to stations and when in depots. Simon Link to post Share on other sites More sharing options...
Zomboid Posted September 19, 2018 Share Posted September 19, 2018 It's behind a paywall Link to post Share on other sites More sharing options...
St. Simon Posted September 19, 2018 Author Share Posted September 19, 2018 It's behind a paywall Ah, my apologies, is this any better: https://www.compelo.com/uk-hybrid-battery-trains-pollution/ Ignore the Class 180 photo, it is about Class 165s Simon Link to post Share on other sites More sharing options...
luckymucklebackit Posted September 19, 2018 Share Posted September 19, 2018 Excuse my ignorance, but I would assume that the size of battery needed to power these units for any reasonable distance will result in a considerable increase in the weight of the train, which will in turn increase the emissions as the diesel engine (when used) will need to work harder to move the train, especially up gradients. Jim Link to post Share on other sites More sharing options...
Edwin_m Posted September 19, 2018 Share Posted September 19, 2018 (edited) Excuse my ignorance, but I would assume that the size of battery needed to power these units for any reasonable distance will result in a considerable increase in the weight of the train, which will in turn increase the emissions as the diesel engine (when used) will need to work harder to move the train, especially up gradients. Jim I can't access that link but if it's as described above it's a similar concept to a hybrid car. As a back-of-envelope estimate, accelerating a 40 tonne coach to 10 metres per second (about 20mph) would require 2MJ of energy or about 555 amp-hours. That's about 14 car batteries, and although you'd need a bit more to cover energy losses a higher-tech battery would probably be more compact and lighter for the same amount of storage. So unlikely to need a radical re-design to fit it in or to make that much difference to the weight. Edited September 19, 2018 by Edwin_m Link to post Share on other sites More sharing options...
KeithHC Posted September 19, 2018 Share Posted September 19, 2018 Also this from railway gazette: https://www.railwaygazette.com/news/single-view/view/hybrid-dmu-projects-announced.html Keith Link to post Share on other sites More sharing options...
woodenhead Posted September 19, 2018 Share Posted September 19, 2018 This sounds like another experiment along the lines of the DVT experiment - something that gets a train away from a station using less fuel, less pollution and less noise Link to post Share on other sites More sharing options...
Glorious NSE Posted September 19, 2018 Share Posted September 19, 2018 I can't access that link but if it's as described above it's a similar concept to a hybrid car. As a back-of-envelope estimate, accelerating a 40 tonne coach to 10 metres per second (about 20mph) would require 2MJ of energy or about 555 amp-hours. That's about 14 car batteries, and although you'd need a bit more to cover energy losses a higher-tech battery would probably be more compact and lighter for the same amount of storage. So unlikely to need a radical re-design to fit it in or to make that much difference to the weight. I'd have thought big changes to the transmission though, as I'd presume they will have to change from hydraulic to electric to allow an electrical boost? Link to post Share on other sites More sharing options...
RMweb Premium Steadfast Posted September 19, 2018 RMweb Premium Share Posted September 19, 2018 Unless the motor is fitted to the output shift? Something akin to KERS in F1, the cars are still driven through the gearbox from the engine, but with motorised assistance, rather than an electric motor in the wheel Jo Link to post Share on other sites More sharing options...
Nearholmer Posted September 19, 2018 Share Posted September 19, 2018 (edited) More likely, I think, for a retrofit, would be to create a parallel hybrid, or even a 'through the rails" hybrid, with some, presently non-driven, axles fitted with electric motors. Edited September 19, 2018 by Nearholmer Link to post Share on other sites More sharing options...
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