Lateral pressures.

TM 38-400/NAVSUP PUB 572/AFMAN 23-210 MCO 4450.14/DLAM 4145.12

bundles of light metal tubing or pipe will undergo a

(3) Doorway protection.

Provide proper

settling from vibrations and may become flattened or

doorway protection to assure that load does not cause

dented. However, if the linoleum is stood on end and

doors of car to bulge or break open when rounding

separation gates are used to divide the load, and if the

curves, and to facilitate opening of doors and assure

pipe or tubing is stowed with a filler between layers to

protection to personnel opening doors (see figs 3-13

absorb the pressures, there is little chance of damage to

the shipment in transit unless the car should be

subjected to abnormal shocks or impacts.

d. Lateral pressures.

(1) Type of action. Lateral pressures are

stresses toward the sidewalls induced by a car rounding

a curve which tends to move the containers out of

alignment. Also, lateral pressures tend to crush the

containers on the off side of the car when rounding a

curve.

Although these pressures are of small

magnitude, if the containers are out of alignment,

subsequent lengthwise forces can cause damage

because of uneven distribution of pressure.

Figure 3-13. Doorway protection for rough freight

only.

(2) Distribution of weights. To ensure against

uneven distribution of weight in the car, the load should

be braced to prevent cross car movement of the load.

Uneven distribution to weight within the care may cause

the side bearings to become fouled and the car derailed,

as the trucks bind and do not roll around curved track.

Of great importance is the side bracing of high center of

gravity items; applicable bracing must be applied to

prevent tipping (fig 3-12). For additional illustrations of

bracing for high center of gravity or top heavy items,

see AAR pamphlets 14 and 21.

Figure 3-14. Flush doorway protection for cars with

wooden doorposts.

Figure 3-12. Side bracing of high center of gravity

items.

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