TM-55-2350-224-14

TM 55-2350-224-14

Figure 3-4. Detail of a cable assembly for rail transport. (Table 3-2 and table 3-3)

Table 3-3. Tiedown Procedures for Securing Carriers on Flatcars (fig 3-1)

Item

Procedure

Chain tiedowns

Install at indicated locations. The number of chains used will depend on chain size/strength. Use

eight chains, NSN 4010–00–803–8858, two for each load binder, or eight chains, NSN

4010-00-443-4845, one for each load binder.

When chain-tiedown-equipped railcars are not available, wire rope and wood blocking must be

used.

Wire rope loops

Each tiedown is made from one piece of wire rope. Four 5/8-in. ropes are required for carriers

weighing 15,000 to 25,000 pounds, one at each tiedown. Eight 1/2-in. ropes are required for carriers

weighing 25,000 to 30,000 pounds, two at each tiedown, using a same-side tiedown pattern.

Length as required (12 to 16 feet). Form a complete loop between carrier tiedown provision and

railcar stake pocket. The angle between the cables and railcar deck (as viewed from the side)

should be as close to 45° as possible. The wire rope ends must overlap at least 24 inches. Tension

the wire rope by using two cable grippers and a (3-ton) come-along or cable tightener.

Cable clamps

For 1/2-in. wire rope, space 1/2-in. cable clamps 3 in. apart. Alternately torque nuts a minimum of

65 ft-lb. For 5/8-in. wire rope, space 5/8-in. cable clamps 3 3/4 in. apart. Alternately torque nuts to a

minimum of 95 ft-lb.

Thimbles

Use thimbles to protect cable at sharp bends. Attach to cable with cable clamps (5/8-in. clamps on

1/2-in. thimbles and 5/8-in. clamps on 5/8-in. thimbles).

Blocking

Position and nail blocking to railcar as shown in figure 3-2.

3-6

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