Code of Federal Regulations Title 49. Transportation § 49.174.85 Position in train of placarded cars, transport vehicles, freight containers, and bulk packagings

1. When train length permits, placarded car may not be nearer than the sixth car from the engine or occupied caboose

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2. When train length does not permit, placarded car must be placed near the middle of the train, but not nearer than the second car from an engine or occupied caboose

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3. A placarded car may not be placed next to an open-top car when any of the lading in the open top car protrudes beyond the car ends, or if the lading shifted, would protrude beyond the car ends.

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4. A placarded car may not be placed next to a loaded flat car, except closed TOFC/COFC equipment, auto carriers, and other specially equipped cars with tie-down devices for securing vehicles. Permanent bulk head flat cars are considered the same as open-top cars

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5. A placarded car may not be placed next to any transport vehicle or freight container having an internal combustion engine or an open-flame device in operation.

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6. Placarded cars may not be placed next to each other based on the following:

Placard Group 1․․․․․․․․․․․․․․․․․․․․․․․․․

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Placard Group 2․․․․․․․․․․․․․․․․․․․․․․․․․

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Placard Group 3․․․․․․․․․․․․․․․․․․․․․․․․․

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Placard Group 4․․․․․․․․․․․․․․․․․․․․․․․․․

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PLACARD GROUP:

Group 1—Divisions 1.1 and 1.2 (explosive) materials.

Group 2—Divisions 1.3, 1.4, 1.5 (explosive), Class 2 (compressed gas; other than Div 2.3, PG I, Zone A), Class 3 (flammable liquid), Class 4 (flammable solid), Class 5 (oxidizing), Class 6 (poisonous liquid; other than Div 6.1, PG I, Zone A), and Class 8 (corrosive) materials.

Group 3—Divisions 2.3 (Zone A;  poisonous gas) and 6.1 (PG I, Zone A; poisonous liquid) materials.

Group 4—Class 7 (radioactive) materials.