Which term describes a mode of operation where a train can be stopped within one half the range of vision and not exceed 15 mph?

• A. Limited Speed
• B. Reduced Speed
• C. Slow Speed
• D. Restricted Speed

Answer: (B)

The key idea is operating under a very low, controlled speed so you can always stop within the distance you can see ahead. When conditions require extra caution, the train is limited to a speed that won’t let you exceed 15 mph, and you must be able to bring the train to a stop within half the range of vision. This combination—a strict speed cap of 15 mph plus the requirement to stop within half the visible distance—is defined in Long Island Railroad practice as reduced speed. It’s about ensuring you have ample stopping distance in limited-visibility or constrained-track situations.

Why this fits best: the scenario directly ties the speed limit (15 mph) to a stopping requirement based on what you can see ahead. Reduced speed captures that specific, safety-focused mode where you deliberately slow down to guarantee you can stop within half the range of vision.

For contrast, the other terms describe different operating conditions. Limited speed refers to speed limits governed by signals or timetable rules but isn’t tied to the half-range stop requirement. Slow speed isn’t a formal operational category in many manuals. Restricted speed generally implies being able to stop within the full range of vision, which is a broader or different standard than the half-range criterion described here.