Spanish companies Enagás , Rail and Rail Natural Fenosa are collaborating with Institut Cerdà , ARMF and Bureau Veritas on the first pilot test for trains powered by compressed natural gas ( LNG ) . The test will involve an LNG - powered locomotive travelling from the Madrid diesel train depot to Figaredo , in Asturias . Enagás, Renfe and Gas Natural Fenosa also claim that they are considering presenting a second phase of the project for the CEF European funding, intended to support the financing and subsidising of innovation projects related to the environmental improvement of transport systems located along the core European rail network corridors. One of two paired diesel locomotives will be powered by a natural gas - powered engine , allowing the diesel and gas engines to be compared .
Spanish companies Enagás , Rail and Rail Natural Fenosa are collaborating with Institut Cerdà , ARMF and Bureau Veritas on the first pilot test for trains powered by compressed natural gas ( LNG ) . The test will involve an LNG - powered locomotive travelling from the Madrid diesel train depot to Figaredo , in Asturias . One of two paired diesel locomotives will be powered by a natural gas - powered engine , allowing the diesel and gas engines to be compared .