Global Rail Freight Transportation Market Assessment, By Cargo Type [Bulk Cargo, Containerized Cargo, Intermodal Cargo, Specialized Cargo], By Traction Type [Electric Traction, Diesel Traction, Hybrid Traction, Hydrogen Traction], By Infrastructure Type [Heavy Haul Railways, Standard Gauge Railways, Narrow Gauge Railways, Dedicated Freight Corridors], By Business Model [Publicly Owned Railways, Privately Owned Railways, Leased Railways, Build-Operate-Transfer Railways], By Region, Opportunities and Forecast, 2017-2031F