Table IV. Determining Average Speed Values
c. Length of division (LD). You know that your division is 110
miles long; therefore, the value for LD in the formula is 110.
d. Using the TD formula. Now that you have a value to substitute
for each of the unknowns, your formula develops as follows:
Once you know what each locomotive can pull, the amount of
freight or payload that can be moved on each train, and the number of
trains you can run each day, you determine the net division tonnage,
as explained in the next paragraph.
2.15. NET DIVISION TONNAGE
The tonnage or payload, expressed in short tons, that can be
moved over any division each day is the net division tonnage (NDT).