During a Heat Warning, freight trains must reduce speed by 10 MPH, but not below what minimum speed?

During a Heat Warning, freight trains must reduce speed by 10 MPH, but not below what minimum speed?

• A. 20 MPH.
• B. 30 MPH.
• C. 25 MPH.
• D. 15 MPH.

Answer: (B)

Heat Warnings set a speed-reduction rule with a floor to ensure safe tracking and braking in hot conditions. Trains must slow by 10 mph, but you can’t drop below a minimum speed of 30 mph. So the minimum allowed speed is 30 mph. If you’re at or above 40 mph, reducing by 10 mph lands you at 30 mph or more; if the reduction would take you below 30 mph, you instead operate at 30 mph. That’s why 30 mph is the correct minimum. The other options would violate the required minimum.

Heat Warnings set a speed-reduction rule with a floor to ensure safe tracking and braking in hot conditions. Trains must slow by 10 mph, but you can’t drop below a minimum speed of 30 mph. So the minimum allowed speed is 30 mph. If you’re at or above 40 mph, reducing by 10 mph lands you at 30 mph or more; if the reduction would take you below 30 mph, you instead operate at 30 mph. That’s why 30 mph is the correct minimum. The other options would violate the required minimum.