TM 55-7440-240-14
GENERAL INSTRUCTIONS
1. All hand brakes are to beset with hand levers wire-tied or blocked. Transmission in neutral position with shift lever wire-tied.
2. If further details are required, refer to General Rules 4, 5, 9, 10, 14, 15, and 19A, section 1, Rules Governing the Loading of
Commodities on Open-Top Cars and Trailers, published by the Association of American Railroads.
Table 7-3. Bill of Materials
for Blocking and Tiedown of
Shelter, S491, on
CON US
General-Purpose Flatcar
Approximate
quantity
Description
Item
Douglas-fir, or comparable, stright-grain, free from material defects; Fed Spec MM-L-
Lumber
751H:
6 linear ft
1- x 6-inch
58 linear ft
2- x 6-inch
Common, steel, flathead, bright, or cement-coated; Fed Spec FF N -105B:
Nail
44
30d
64
60d
80 ft
6 x 19 IWRC, improved plow steel, preformed, regular-lay; Fed Spec RR -W-410C:
3/8-inch
Wire rope
Wire rope, U-bolt clips, saddled, single grip, steel, Crosby heavy-duty or equal; Fed Spec
Clamps
24
FF-C-450D: 3/8-inch
8
Standard, open-type: 3/8-inch
Thimbles
Table 7-4. Application of Materials
for Blocking and Tiedown of
Shelter, S491, on
CON US
General-Purpose Flatcar
Application
Item
No. required
_
Brake-wheel clearance. Minimum clearance required is 6 inches above, in back of, and on both
A
sides of, and 4 inches underneath wheel, 12 inches minimum clearance from end of car to load,
extending from center of brake wheel to side of car and 6 feet above car floor (fig 7-5).
--
B
Clearance to any vehicle loaded on car with shelter is 24 inches minimum.
Header block. Each to consist of three pieces of 2- x 6- x 44-inch lumber. Locate bottom piece
2
c
on car floor so that when second and third piece are added, the header will be against end of
shelter. Nail the first piece to car floor with six 30d nails. Nail other pieces to lower pieces
with six 30d nails each.
Backup cleat. Each to consist of three pieces of 2- x 6- x 30-inch lumber. Locate bottom piece
D
4
on car floor 3 inches in from end of item C. Nail to car floor with five 30d nails. Nail other
pieces to lower piece with five 30d nails each.
E
Side block. Each to consist of one piece of 1- x 6-18-inch lumber and one piece of 2- x 6- x 18-
4
inch lumber. Locate 1- x 6- x 18-inch piece against shelter skid. Locate 2- x 6- x 18-inch
piece on top of lower piece and nail down pieces to car floor with three 30d nails.
F
4
Wire rope (detail 3, fig 7-4). Each to consist of one piece 3/8-inch 6 x 19 IWRC wire rope,
length as required (approximately 20 ft). Form a complete loop between tiedown provision
and appropriate stake pocket. Wire rope ends should overlap approximately 24 inches.
G
24
Clamps (detail 3, fig 7-4). Place four on each item F at overlap area. Space clamps 3- inches
apart with a minimum of 6 inches from ends of wire rope. Place one clamp on each thimble,
item H, to secure thimble to wire rope at stake pockets and shelter tiedown provisions.
Thimbles (detail 3, fig 74). Locate one under wire rope at each place where wire rope passes
H
over edge of stake pocket and tiedown provision. Secure thimble to wire rope with one 3/8-inch
clamp.