The life expectancy of diesel-electric and electric locomotives is expected to be similar—about 25 years. Both types of motive power are subject to technological obsolescence.
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Many locomotives can last 30–40 years, depending on the maintenance done on them.
A train engine requires about a hundred litres of fuel to get it started. So it wouldn't be economical if the engine is stopped and started frequently. This apart, if the engine is stopped, the moving parts' lubrication will also come to a halt.
When it's moving at 55 miles an hour, it can take a mile or more to stop after the locomotive engineer fully applies the emergency brake. An 8-car passenger train moving at 80 miles an hour needs about a mile to stop.
While many of us change our car tires every 50,000 miles or so, Metro rail wheels can travel as far as 700,000 miles before they need to be replaced. Good thing because changing the wheels on a single rail car can take more than a week, depending on the design of the car.
The SD45s were good, but not enough for the railroad. Union Pacific reached out to EMD for more power, and the result was the behemoth EMD DDA40X. Often cited as both the largest and most powerful diesel-electric locomotive ever built, the 98-foot, 5-inch, 475,830-pound machine is staggering.
The “Tom Thumb” has been known as the first successful American steam locomotive. It hauled passengers until at least March 1831 but was never placed into regular service. The “Tom Thumb” was salvaged for parts in 1834.
1000 miles between refuellings would not be unreasonable for a road locomotive with a 4000 gallon tank averaging 40 mph on a line with a maximum grade of 1%. However I would want refuel before I am running on the bottom third of the tank, so perhaps 700 miles is more realistic.
In temperatures below 40 degrees Fahrenheit, the engine has to be kept warm for engine fluids to work properly, as antifreeze cannot be used in locomotive engines. Engines are also kept running to provide air conditioning or heat for the crew, which may be aboard even if the train is idling in a yard.
To help the wheels stay on the track their shape is usually slightly conical. This means that the inside of the wheel has a larger circumference than the outside of the wheel. (They also have a flange, or raised edge, on the inner side to prevent the train from falling off the tracks.)
rather than pay for the expense of maintaining track to a higher standard, and having to maintain the additional cab signals, and having to outfit all locomotives that use the line with cab signals, or ATS, or ATC, the freight RRs simply place the speed limit at 79 mph, and use Automatic Block signal systems.