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i'm pretty sure a slug is like a helper engine for the switching
this is off wika-pidia
"A railroad slug is an accessory to a diesle-electric locomotive. It has trucks with traction motors but is unable to move about under its own power, as it does not contain a prime mover to produce electricity. Instead, it is connected to a locomotive, called the mother, which provides current to operate the traction motors.
The slug concept is similar to switching from two wheel drive to four wheel drive in an automobile."
for example, there are cabless slugs, or a yard slug, there are also road slugs here is off wika-pidia agian --->
"Slugs are used in situations where tractive effort is more important than extra power, such as switching operations in yerds. At low speeds, a diesle-electric locomotive's prime mover can produce more electric power than its traction motors can use. Extra power would simply cause the wheels to slip and/or overheat the traction motors. A slug effectively adds axles to the locomotive, increasing both the pulling and braking power. Slugs carry ballast to increase their weight and improve traction. Large blocks of conctere are frequently used for this purpose, substituting for the weight of the now-absent diesel engine(s).
Slugs can be built new or converted from existing locomotives. Conversion has enjoyed popularity as a way to reuse otherwise obsolete engines."
Gets rather slick and makes it hard to stopNah, we wouldn't want slugs blubbering over our beloved rail network![]()