Train engines are typically not turned off during stops or layovers for several reasons:
Efficiency: Train engines, especially diesel locomotives, are designed to operate most efficiently when running continuously at a steady speed. Shutting down and restarting a locomotive can consume a significant amount of fuel and require additional maintenance.
Power Supply: Train engines provide power not only for propulsion but also for various onboard systems, including heating, lighting, and air conditioning. Keeping the engine running ensures a stable power supply to these systems, especially during extended stops or layovers.
Maintaining Air Pressure: Many trains use air brakes, which rely on compressed air to operate. Keeping the engine running maintains the air pressure needed for effective braking, ensuring the safety of the train while it is stationary.
Quick Departure: Keeping the engine running allows the train to depart more quickly when it's time to resume the journey. Instead of waiting for the engine to restart and build up sufficient pressure, the train can simply release the brakes and accelerate.
As for the lifespan of train engines, it can vary depending on factors such as maintenance, usage, and technological advancements. Diesel locomotives typically have a lifespan of several decades, with proper maintenance and refurbishment extending their service life even further. Electric locomotives can have even longer lifespans since they have fewer moving parts and undergo less wear and tear. However, advancements in technology and changes in operational requirements may eventually lead to the retirement or replacement of older locomotives with more modern and efficient models.
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