What primary material served as the fuel to heat the water for the boiler?

Answer

Coal

Coal was the essential fuel source used to heat the water in the boiler. This choice was not merely based on availability, but on the requirements of the system. The high-pressure boiler needed a robust, high-temperature fire to rapidly generate steam, which necessitated a fuel with high energy density. The proximity of the engine trials to coal-rich regions allowed for a reliable supply of this fuel, establishing the long-standing reliance of the railway industry on coal-based energy for decades.

What primary material served as the fuel to heat the water for the boiler?

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