In the TPOB calculation after en route pickup, what is the denominator?

In the TPOB calculation after en route pickup, what is the denominator?

• A. Total trailing tonnage
• B. Total number of cars in train
• C. Total number of cars having operative brakes
• D. Total number of axles

Answer: (C)

The main idea is that TPOB measures braking readiness by looking at how many cars in the train can actually contribute to braking. After en route pickup you may add cars that have good brakes and some that don’t. Only the cars with operable brakes can affect braking performance, so the denominator should be the total number of cars whose brakes are operative. If you used something like the train’s weight (trailing tonnage) or the total number of cars in the train, you’d include cars that can’t brake, which would distort the assessment. The total number of axles isn’t directly tied to brake operability. So, the best choice is the count of cars that have operative brakes.

The main idea is that TPOB measures braking readiness by looking at how many cars in the train can actually contribute to braking. After en route pickup you may add cars that have good brakes and some that don’t. Only the cars with operable brakes can affect braking performance, so the denominator should be the total number of cars whose brakes are operative. If you used something like the train’s weight (trailing tonnage) or the total number of cars in the train, you’d include cars that can’t brake, which would distort the assessment. The total number of axles isn’t directly tied to brake operability. So, the best choice is the count of cars that have operative brakes.