How many switch machines will need to be operated to properly line up a crossover identified as an (11-3) type crossover?

How many switch machines will need to be operated to properly line up a crossover identified as an (11-3) type crossover?

• A. 4
• B. 6
• C. 3
• D. 5

Answer: (B)

To line up a crossover correctly, you have to position every movable point so that the rails form a continuous path for the chosen route. Each movable point is controlled by its own switch machine, so the total number you operate equals the number of points that must be moved. For an (11-3) type crossover, there are three movable points on each side of the crossing. That means you need to operate six switch machines in total to set the crossover for the desired direction. If fewer machines are operated, one or more points would stay misaligned, risking improper routing or a derailment. This is why six switch machines is the correct total for this crossover type.

To line up a crossover correctly, you have to position every movable point so that the rails form a continuous path for the chosen route. Each movable point is controlled by its own switch machine, so the total number you operate equals the number of points that must be moved.

For an (11-3) type crossover, there are three movable points on each side of the crossing. That means you need to operate six switch machines in total to set the crossover for the desired direction. If fewer machines are operated, one or more points would stay misaligned, risking improper routing or a derailment. This is why six switch machines is the correct total for this crossover type.