From Longman Dictionary of Contemporary Englishlight railwayˌlight ˈrailway British English, light rail American English noun [countable] TTTan electric railway system that uses light trains and usually carries only passengers, not goods
Examples from the Corpus
light railway• If those words are retained in the legislation, those railways would still require a light railway order at some time.• The company have retained the leisurely atmosphere of the turn-of-the-century light railway being situated off the major tourist circuits.• The only other opportunity in the foreseeable future is likely to be the new light railway in London's Docklands. 