Which statement correctly describes where Auto-Rack cars must not be placed in a train relative to open-top cars?

Which statement correctly describes where Auto-Rack cars must not be placed in a train relative to open-top cars?

• A. They must be placed behind open-top cars loaded with sand
• B. They must be placed in front of open-top cars
• C. They must not be placed behind open-top cars loaded with stone, coal, or gravel
• D. They can be placed anywhere if secured

Answer: (C)

The key idea is safety around loose bulk loads. Open-top cars carrying stone, coal, or gravel can have loads that shift or spill when the train moves. If an Auto-Rack is placed behind one of these cars, material from the open-top car can spill toward and potentially strike or clog the Auto-Rack’s top and surroundings, risking damage to the car or its cargo and creating hazards for crew during movement or handling. So the rule specifies not placing Auto-Rack cars behind open-top cars loaded with those bulk materials. The other scenarios don’t fit because securing doesn’t eliminate the risk of shifting bulk loads, and being in front of such cars wouldn’t inherently remove the hazard, while the rule is specifically about avoiding placement behind those loads.

The key idea is safety around loose bulk loads. Open-top cars carrying stone, coal, or gravel can have loads that shift or spill when the train moves. If an Auto-Rack is placed behind one of these cars, material from the open-top car can spill toward and potentially strike or clog the Auto-Rack’s top and surroundings, risking damage to the car or its cargo and creating hazards for crew during movement or handling. So the rule specifies not placing Auto-Rack cars behind open-top cars loaded with those bulk materials. The other scenarios don’t fit because securing doesn’t eliminate the risk of shifting bulk loads, and being in front of such cars wouldn’t inherently remove the hazard, while the rule is specifically about avoiding placement behind those loads.