Practice question

An emergency brake application on a freight train will typically propagate from the locomotive to the rear of the train at approximately:

  1. The speed of sound (approximately 1,125 ft/sec)
  2. Much slower than sound — at roughly 900 to 1,200 ft/sec through the train line
  3. Instantly through electronic signal to each car
  4. At 100 ft/sec, limited by the speed of air through brake hoses

Answer: B — Much slower than sound — at roughly 900 to 1,200 ft/sec through the train line

The correct answer is shown above. Try the full quiz for additional practice.

Practice more: FRA Conductor Practice Questions - FRA Certified Conductor Exam →