TM 55-2200-001-12
Change 3
Section No. 1--General Rules (New--1-1976)
GENERAL NOTES
1.
The loaded car or cars must be on level track when measured.
2.
All vertical height measurements must be perpendicular to the plane of the tops of level rails.
3.
All horizontal width and length measurements must be parallel to the plane of the tops of level rails.
4.
Locate longitudinal center line of car. The longitudinal center line is the line (from one end of car to the
other end of the car) that is parallel to the sides of the car and divides the width of the car into two equal parts.
5.
Measure width from the longitudinal center line of car (or from the vertical projection of this line) to all
points on each side of load where width changes and double (or multiply by two) each such measurement so as to obtain
the maximum widths of the load.
6.
Use straightedge across rails and measure to top of car deck.
7.
Measure height above deck of car to all points on each side of load where width changes.
8.
The height above top of rail (ATR) is obtained by adding the height of the car deck, above top of rail, to the
height or heights of the load where the width changes.
9.
For double, triple and end overhanging load, the heights "H" and the widths "W" must be given for the
overhanging ends and also between the load bolsters at the location where the load is the maximum size. If there are
changes in size of the load on the overhang(s) or on the load between the bolsters, dimensions must be shown for these
changes and their location defined with respect to load bolster or truck center.
10.
For recording or reporting purposes, all changes in width are to be shown by giving maximum width (twice
width from center-line of car) and height ATR (height above top of rail) for each change in width.
11.
In recording and reporting dimensions of load projecting beyond end sill, one or more cars, furnish the
following:
(a)
Oar numbers.
(b)
Overall length of load.
(c)
Type of load, whether single, double triple or single or double end overhang.
(d)
Length of overhangs and complete dimensions of same. Length of overhang must be measured from center of
truck on carrying car to end of load.
(e)
Distance center to center of load bolsters.
(f)
Distance from nearest truck center to center of load bolster on double or triple loads.
12.
See General Rule 7 for additional information.
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