In routine daily maintenance of a steam engine, what should be prioritized first?

In the routine daily maintenance of a steam engine, prioritizing the lubricators is crucial due to their vital role in ensuring the proper functioning of the engine. Lubrication reduces friction between moving parts, preventing excessive wear and tear and potential operational failures. If lubrication is neglected, parts can overheat and seize, leading to costly repairs and downtime.

While fuel supply, boiler pressure, and cooling systems are also important aspects of steam engine operation, ensuring proper lubrication directly impacts the engine's reliability and efficiency. Inadequate lubrication can lead to immediate mechanical issues, whereas the other elements, such as fuel supply and boiler pressure, often have built-in safety mechanisms or indicators that can alert operators to potential problems. Therefore, attending to the lubricators first is essential for maintaining optimal performance and longevity of the steam engine.