Global Hopper Car Market Assessment, By Car Type [Covered Hopper Cars, Open Hopper Cars, Specialized Hopper Cars, Others], By Capacity Type [Small-Capacity Hopper Cars, Medium-Capacity Hopper Cars, High-Capacity Hopper Cars], By Sales Channel [Direct Sales, Dealers/Distributors, Leasing and Rentals], By Region, Opportunities and Forecast, 2018-2032F