Pooled Power

[Charlie B]

Another reason is to keep the train moving, it is easier to change crew rather than power. As long as the power is compatible with the signals on another road the train can be left with the "foreign" power in the lead, if not a home road loco will be added. They keep track of the megawatt hours and that is how they keep even on it today.
I hear the term "run through power" more often today, and I am not sure if the meaning has remained the same over the years.
I see the consist left in tact quite often on CSX but seldom see foreign power on the point on NS around here.
Charlie