Global Train Battery Market Size, Share and Analysis Report By Battery Type (Lithium-ion batteries, Lead-acid batteries and Nickel-cadmium (Ni-Cd) batteries), By Application (Starter batteries, Auxiliary batteries and Propulsion / traction batteries), By Train Type (Metros / Light Rail, Locomotives, Multiple Units and Passenger coaches & freight wagons), By Advanced Train Type (Battery-powered trains (BEMUs), Hybrid trains and Conventional trains with battery backup only), By Region and Companies - Industry Segment Outlook, Market Assessment, Competition Scenario, Trends and Forecast 2026-2035