Define 'Medium Speed'.

Define 'Medium Speed'.

• A. 15 mph
• B. 45 mph
• C. 30 mph
• D. 25 mph

Answer: (C)

Medium speed is a moderate operating pace used on mainline track that allows steady progress while still ensuring you can stop within the required braking distance for signals and track conditions. In this context, 30 mph is the defined value for medium speed, sitting between slower, restricted movements and faster mainline speeds. It represents a balance: not so slow as to hamper efficiency in normal operation, and not so fast as to require the larger stopping margins of higher speeds. The other numbers don’t fit this category because 15 mph is a slow, restricted speed, 25 mph is still below the defined medium range, and 45 mph would be considered a faster speed, not medium. Understanding these speed categories helps you apply rules for braking, signaling, and track protection so you know what speed is permissible in different situations.

Medium speed is a moderate operating pace used on mainline track that allows steady progress while still ensuring you can stop within the required braking distance for signals and track conditions. In this context, 30 mph is the defined value for medium speed, sitting between slower, restricted movements and faster mainline speeds. It represents a balance: not so slow as to hamper efficiency in normal operation, and not so fast as to require the larger stopping margins of higher speeds. The other numbers don’t fit this category because 15 mph is a slow, restricted speed, 25 mph is still below the defined medium range, and 45 mph would be considered a faster speed, not medium. Understanding these speed categories helps you apply rules for braking, signaling, and track protection so you know what speed is permissible in different situations.