Autonomous Train Technology Market by Grade of Automation (GOA 1, GOA 2, GOA 3, and GOA 4), Train Type (Passenger Train and Freight Train), Technology (CBTC, ETRMS, ATC, and PTC), and Component (Camera, Accelerometer, Odometer, Tachometer, Radio Set, and Others): Global Opportunity Analysis and Industry Forecast, 2019 - 2026