1. The universities’ centre for railway systems research Flywheel Energy Storage for Regional Rail Matthew Read, Professor Roderick Smith Future Railway Research Centre Imperial College London

2. Matthew ReadEmail: m.read06@imperial.ac.uk UK Diesel Trains ●Diesel trains use 40% of total traction energy ●Where is this energy used in the vehicle? Intercity Diesel-Electric Regional Diesel-Hydrodynamic 13% 19% 40% 43% Source: ‘Improving the efficiency of traction energy use’, RSSB report

3. Matthew ReadEmail: m.read06@imperial.ac.uk Energy storage for trains Energy/kg Power/kg Ultra-caps Hydraulics Batteries Requirements for regen braking Advanced flywheels

4. Matthew ReadEmail: m.read06@imperial.ac.uk My research ●Creation of computational model ●Model allows: ■ Characterisation of existing vehicles ■ Investigation of route, driver and power-train variables ■ Study of flywheel systems Inputs Control parameters Power-train efficiency Fuel consumption Vehicle data Outputs Route data Diesel-hydrodynamic vehicle model Speed profile

5. Matthew ReadEmail: m.read06@imperial.ac.uk Mechanical flywheel transmissions ●Planetary gear set forms core of transmission ●Innovative control methods proposed: ■ Simple hydraulic system ■ Mechanical friction brake/clutch system Advanced flywheel Final drive Sun gear Planet carrier Control via ring gear

6. Matthew ReadEmail: m.read06@imperial.ac.uk Results ●Flywheel transmission efficiency ~ 90% ●30% fuel saving possible for branch line operation ●Flywheel systems offer a potentially light-weight, robust and efficient energy storage solution Conventional vehicle Flywheel hybrid

7. The universities’ centre for railway systems research Thank You Any Questions? Matthew Read Email: m.read06@imperial.ac.uk Tel: +44 (0)20 7594 7203