Why was coal eventually preferred over wood as a fuel for steam locomotives?
Answer
It provided superior energy density and lasted longer per load
Coal offered a significantly higher energy density compared to wood, meaning that for the same physical weight, a load of coal could sustain a fire for a much longer period and produce more steam. This efficiency was crucial for railroads because it reduced the need for frequent refueling stops, which were time-consuming and logistically challenging. While wood was readily available in many regions, the transition to coal represented a strategic operational shift that allowed locomotives to travel greater distances and haul heavier loads effectively.
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