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Page Title:
Test Procedure for Rail Shipment |
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|  MIL-T-52953C
APPENDIX
TEST PROCEDURE FOR RAIL SHIPMENT
Step 1. From one to five rail cars shall be positioned on a level section of
track. The following conditions shall be satisfied:
a.
The total weight of the car(s) shall be at least 114,000 kilograms
(250,000 pounds).
b.
The couplers between cars shall be compressed to take up any
slack.
c.
All of the air and hand brakes on the car(s) used shall be set.
d.
Any load in or on the car(s) shall be secured to prevent sliding
or shifting; any movement greater than 5 cm shall be justification
for retest.
e.
The end of the buffer car to be struck must have a standard draft
gear.
Step 2. Mount the test item on the test car. The test car shall be equipped
with standard draft gears and conventional underframes. Mounting of the test
item shall incorporate the standard loading and bracing method as shown in
section 6 of the Association of American Railroads (AAR) "Rules Governing the
Loading of Department of Defense Materiel on Open Top Cars." No exotic or
unusual tiedown methods shall be used; any non-standard loading and bracing
must be approved by the Military Traffic Management Command Transportation
Engineering Agency (MTMCTEA), ATTN: MTT-TR, P.0. Box 6276, Newport News, VA
23606-0276 prior to testing. Substitute (dummy) test items must be of equal
weight and weight distribution as the actual test item and similar in shape.
The arrangement of the test item and its blocking and tiedown to be tested
shall be identical to that proposed and approved by MTMCTEA (if non-standard).
This requirement is mandatory for all equipment developed for use in the U.S.
Equivalent European standards may apply for non-U.S. commodities.
Step 3. Situate the test car between the buffer cars and the locomotive, and
pull the test car at least 65 meters (200 feet) from the buffer car(s) along a
level section of track (a minimum distance to achieve the required locomotive
speeds).
Step 4.
Position the knuckles of the buffer and test cars for coupling.
Step 5. Install a timing device to measure the test car speed ( .1 km/hr)
just prior to impact with the buffer car(s). Suggested methods include
electronic timing ( microswitches) and radar. The use of torpedoes and a
stopwatch is permissible but not recommended because of the inaccuracies
involved.
Step 6. Push the test car toward the buffer car(s) and, by using the
locomotive's speedometer or other means, release the test car when the desired
test speed is reached, thus allowing the test car to freely impact the buffer
car (s).
Step 7. Repeat step 6 until the test car(s) has impacted the buffer car three
times at the same end, once each at speeds of 6.4, 9.7 and 13.0 km/hr (4, 6,
39
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