Sir Richard Branson's Virgin Group has embarked on yet another venture -- Virgin Trains, which seeks to replace traditional diesel trains with models run on biofuel.

Virgin Trains' pilot project will test a train running on 20% biological material (typically a type of vegetable oil) in Britain for six months. If the test is successful, Virgin Trains will use the 20% mix full-time, with an eye toward engines run purely on biofuel. Virgin Trains says that switching to biodiesel could cut emissions by 14%.