Global Small Diesel Engine Market By Type (KW < 8 (hp < 11), 8 kW < 19 (11 hp < 25), 19 kW < 37 (25 hp < 50),and Others), By Application (Railway Locomotives, Marine Vessels, and Others), By Region and Key Companies - Industry Segment Outlook, Market Assessment, Competition Scenario, Trends and Forecast 2019–2028