These would be perfect for adding rapid charging. They have everything you need, just replace the batteries with fast charging LTO batteries, and a charging station, and voila. They can run on battery only most of the time, with the diesel kicking in only when needed as a backup. Practically no additional engineering, with a much bigger payback, instead of getting just 20-30% better fuel economy (still uses diesel you know!) , you could shift to almost 100% electric operation. What's the hold up? More info: www.nanobus.org * Electric operation with hybrid drive system * 20-30 percent lower diesel consumption and CO2 emissions * No emissions and practically silent during some stretches along the routes * One of the world’s largest lithium-ion batteries in use in a vehicle