Re: Using "The Tool" (truck ream)?
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I have never heard of any mechanical advantage to roller bearing equipped
freight cars. When a car is rolling there is virtually no friction at all for
either plain or roller bearings. Any friction would result in uncontrollable
increases in heat that would melt the journal.
In very cold weather, the oil in plain bearings does provide some resistance but
it warms up quickly.
Hand brakes are typically applied on standing freight cars.