The final computation is for net division tonnage (NDT).
NDT = TD x NTL
NDT = 7 x 311
NDT = 2,177 STON
2.20. THIRD DIVISION NDT
The motive power used for the third division is the same as that
on the first division; therefore, you begin your computations with
GTL.
The second computation is for net trainload (NTL).
NTL = GTL x 50%
NTL = 981 x .50
NTL = 490+, or 491 STON
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