Most of the passengers emerging from the station in Bellvitge, a working-class neighborhood outside Barcelona, have no idea just how innovative the city’s subway system is. Using technology not unlike ...

A new battery-supercapacitor hybrid system will go online soon in Philadelphia, aimed at providing split-second power on-demand to the entire city and running the subway network at the same time.

The Catalan city of Barcelona, home to Sagrada Família, is now partially powered by its own Metro underground trains, thanks to a system called regenerative braking. When an electric vehicle is slowed ...

Two of the key selling points of hybrid and electric vehicles are that they’re both more energy-efficient and, over time, need less maintenance than regular internal combustion engine vehicles. Both ...

A $2.72 billion project to replace diesel trains with electric trains on the San Francisco Bay Area commuter railroad increased train service, attracting more riders.

Q: Is the idea of downshifting when going down a hill outdated for hybrid vehicles with regenerative braking? I grew up with the idea that one should always downshift on long downhills to avoid brake ...