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TM 55-3930-660-14
Table 3-2. Bill of Materials for Transport by Railcar (Fig 3-1)
Item
Quantity
Description
Wire rope
(8 loops
required)
Cable clamps
(clips)
Thimbles
Lumber
(nominal sizes)
2 x 4 in.
2 x 6 in.
2 x 8 in.
2 x 10 in.
Nails
16d
Protective
Material
Strapping
About 160
ft
16
32
16
36 ft*
12 ft*
96 ft*
32 ft*
4 pounds
2 pounds
About
12 ft2
25 ft
1/2-in., improved plow steel,
6X19 class, IWRC (indepen-
dent wire rope core) or wire-
strand core, nominal break-
ing strength 23,00 pounds;
Fed Spec RR-W-410 NSN
4010-00-272-8848
5/8-in., Type I, single-saddle,
wire-rope clamp, Fed Spec
FF-C-450
1/2-in., Crosby heavy-duty or
one that exceeds Fed Spec
FF-C-450 strength require-
ments.
1/2-in., Type III (heavy) split
oval construction (open pat-
tern); Fed Spec FF-T-276
Douglas-fir, or comparable;
Fed Spec MM-L-751
Common, steel, flathead;
bright or cement-coated; Fed
Spec FF-N-105
Waterproof paper (tar paper)
20d
About
Nonmetallic banding
required)
When 5/8-in. cable is used, the following quantitites apply:
Wire rope
About
‘
5/8-in., improved plow steel,
(4 loops
70 ft
6x19 class, IWRC (indepen-
dent wire rope core) or wire-
strand core, nominal break-
ing strength 35,800 pounds;
Fed Spec RR-W-410 NSN
40 1 0 - 7 6 3 - 5 6 02
Cable clamps
8
3/4-in., Type I, single-saddle,
(clips)
wire-rope clamp, Fed Spec
FF-C-450
16
5/8-in., Crosby heavy duty or
one that exceeds Fed Spec
FF-C-450 strength require-
ments.
Thimbles
8
5/8-in., Type III (heavy) split
oval construction (open pat-
tern); Fed Spec FF-T-276.
Use of thimbles is optional
on the VRRTFL fittings.
Table 3-3. Tiedown Procedures for Securing 6K VRRTFL on
Flatcar (Fig 3-1)
Item
Procedure
Chain
Install at indicated locations. The number of
tiedowns
chains used will depend on chain
size/strength. Use eight 1/2-in. chains (4 in
each direction), or twelve 3/8-in. chains (6 in
each direction).
*NOTE*
When chain-tiedown-equipped railcars are
not available, wire rope and wooden block-
ing must be used.
Wire rope
loops
Cable clamps
Thimbles
Blocking
Strapping
Each tiedown is made from one piece of 1/2-in.
wire rope (8 required), or 5/8-in. wire rope (4
required). Length as required (12 to 16 feet).
Form a complete loop between forklift-truck
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 over-
lap at least 24 inches. Tension the wire rope
by using two cable grippers and a chain-hoist
(3-ton) or “come-along.”
Space clamps 3-3/4-in. apart as shown. With
1/2-in. wire rope, use 1/2-in. cable clamps and
alternately torque nuts to 65 ft-lb. (With 5/8-
in. wire rope, use 5/8-in. cable clamps torqued
to 95 ft-lb.)
Use thimbles to protect cable at sharp bends.
Attach to cable with cable clamps (5/8-in.
clamps on 1/2-in. thimbles and 3/4-in. clamps
on 5/8-in. thimbles). Thimbles are optional for
the VRRTFL fittings.
Position and nail blocking to railcar. Band
operators’ cab to keep door closed in-transit.
*NOTE*
To develop full cable loop working
strength, cable clamp nuts must be
torqued to:
65 ft-lb on 1/2-in. clamp nuts.
95 ft-lb on 5/8-in. clamp nuts.
To ensure proper torque, alternately
torque both nuts.
*Linear
3-2
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