When a train is going down a gradient of 2 in 100 against a path (track) resistance of 40 N/Tonne, the available traction effort is 57600 N. If the speed is to be maintained at 40 km/hr, how much electric power will be available to reinvest the source by regenerative braking?

• A. 640 kW
• B. 1280 kW
• C. 320 kW
• D. 2560 kW