What are the top coal logistics and terminal companies operating in India, and how do major players such as Adani Logistics, Coal Hub Logistics, Agarwal Coal Corporation, Mercator Ltd., and Karam Chand Thapar & Bros contribute to coal transportation, storage, and port handling infrastructure across the country? Additionally, what key factors such as terminal capacity, multimodal connectivity, logistics efficiency, and regulatory compliance should be considered when evaluating the leading coal logistics and terminal companies in India?