Canadian National Railways is running a limited experiment with a pair of retro-fitted diesel locomotives converted to running on natural gas:
Canadian National Railway is exploring whether its feasible to use cheap and relatively clean natural gas to power its trains instead of diesel.
CN has retrofitted two of its existing diesel-fired locomotives to run mainly on natural gas. It’s testing the locomotives along the 480-kilometre stretch between Edmonton, a key energy processing and pipeline hub, and the oilsands epicentre of Fort McMurray, Alta.
Longer term, CN and three other partners are looking at developing an all-new natural gas locomotive engine as well as a specialized tank car to carry the fuel.