A solid block of cars added to a through train at an intermediate location must receive a Class I brake test.

A solid block of cars added to a through train at an intermediate location must receive a Class I brake test.

• A. True.
• B. False.
• C. Only if it has been off air for more than 24 hours.
• D. Only if it is a duplicate car.

Answer: (A)

Whenever a solid block of cars is added to a through train at an intermediate location, a Class I brake test is required to confirm the braking system still functions properly with the new consist. The brake system relies on a continuous brake pipe through all cars, and adding cars can introduce leaks, misconnected lines, or improper brake cylinder operation that may not be evident without testing. The Class I test checks that the air pressure is correct, brakes apply and release properly across the entire train, and there are no faults that would prevent effective braking. This safeguard is needed because safety depends on braking performance after any change to the train’s makeup, regardless of whether the addition is large or small or other timing considerations.

Whenever a solid block of cars is added to a through train at an intermediate location, a Class I brake test is required to confirm the braking system still functions properly with the new consist. The brake system relies on a continuous brake pipe through all cars, and adding cars can introduce leaks, misconnected lines, or improper brake cylinder operation that may not be evident without testing. The Class I test checks that the air pressure is correct, brakes apply and release properly across the entire train, and there are no faults that would prevent effective braking. This safeguard is needed because safety depends on braking performance after any change to the train’s makeup, regardless of whether the addition is large or small or other timing considerations.