If a train picks up a solid block of cars from a previous train, with the cars set out in two tracks, after adding the cars, is an ITBT Class I required before proceeding?

If a train picks up a solid block of cars from a previous train, with the cars set out in two tracks, after adding the cars, is an ITBT Class I required before proceeding?

• A. Yes, always
• B. No, as long as the cars were re-coupled in the same relative order as removed
• C. Only if more than five cars were added
• D. No, never

Answer: (B)

In-Train Brake Test (ITBT) is used to verify that the brake system still works correctly after changes to the train’s consist. The crucial point here is whether the block of cars is reassembled exactly in the same relative order as when they were removed. If they are re-coupled in that same order, the brake piping, valves, and overall brake-control path stay the same, so no new testing is needed. If the order were changed or cars from different sources were mixed in, the brake-control path could be altered, and an ITBT would be required to confirm everything operates correctly. So, the best answer is: no, ITBT Class I is not required as long as the cars are re-coupled in the same relative order as removed.

In-Train Brake Test (ITBT) is used to verify that the brake system still works correctly after changes to the train’s consist. The crucial point here is whether the block of cars is reassembled exactly in the same relative order as when they were removed. If they are re-coupled in that same order, the brake piping, valves, and overall brake-control path stay the same, so no new testing is needed.

If the order were changed or cars from different sources were mixed in, the brake-control path could be altered, and an ITBT would be required to confirm everything operates correctly.

So, the best answer is: no, ITBT Class I is not required as long as the cars are re-coupled in the same relative order as removed.