The third computation is for train density (TD)
The final computation for the third division is for the net
division tonnage (NDT).
NDT = TD x NTL
NDT = 15 x 491
NDT = 7,365 STON
2.21. END DELIVERY TONNAGE FOR THE LINE
Now that you have found the net division tonnage for all three
divisions (lst division6,285 short tons; 2d division2,177 short
tons; 3d division7,365 short tons), you know that the end delivery
tonnage (EDT) is the same as that of the net division tonnage of the
most restrictive divisionthe 2d division with 2,177 short tons.
2.22. METHODS OF ADJUSTING EDT
If you were planning an actual railway operation similar to the
one presented in paragraphs 2.17 through 2.21, you would want to
examine the weak division to see if the net division tonnage could be
increased so that the EDT could be raised. The 2d division in the
example has a very low NDT in relation to the other two divisions.
It can be increased either by doubleheading the locomotives or by
constructing more passing tracks. Each of these methods is discussed
in the following subparagraphs.