Inside interlockings, what is the maximum speed under restricting speed rules?

Inside interlockings, what is the maximum speed under restricting speed rules?

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

Answer: (A)

Inside interlockings, operating at a restricting speed is about being able to stop within the distance you can see and within the complex, switch-heavy environment ahead. The interlocking area has multiple signals, potential conflicting movements, and track work that can change quickly, so you need very tight control of train speed to respond safely to any aspect of the interlocking. 15 mph is the standard maximum for restricting speed in interlockings, because it provides enough margin to stop for a signal at danger or an unexpected obstruction while still allowing progress through the interlocking. Going faster would reduce your ability to stop in time given the limited sighting distance and the complexity of the track. So, the maximum speed under restricting speed rules inside interlockings is 15 mph.

Inside interlockings, operating at a restricting speed is about being able to stop within the distance you can see and within the complex, switch-heavy environment ahead. The interlocking area has multiple signals, potential conflicting movements, and track work that can change quickly, so you need very tight control of train speed to respond safely to any aspect of the interlocking.

15 mph is the standard maximum for restricting speed in interlockings, because it provides enough margin to stop for a signal at danger or an unexpected obstruction while still allowing progress through the interlocking. Going faster would reduce your ability to stop in time given the limited sighting distance and the complexity of the track.

So, the maximum speed under restricting speed rules inside interlockings is 15 mph.