How many articulated locked train gears are used in the high-speed system?

• A. One
• B. Two
• C. Three
• D. Four

Answer: (B)

The key idea is that transmitting power at high speed requires a gear arrangement that stays rigid, maintains precise tooth contact, and can accommodate small movements from shaft deflection or thermal expansion. An articulated locked train gear setup does exactly that by linking gear stages so they act as a unit, while still allowing the train to articulate enough to keep teeth properly meshed under varying loads. In the high-speed system, two such gears are used to share the load and provide the needed stiffness and reliability without overcomplicating the design. A single gear wouldn’t offer the same level of load distribution and alignment control, and adding more than two would add unnecessary complexity, space, and maintenance considerations.