Which acronym is listed as the answer for the Normal switch position route selection relay?

• A. Bns
• B. Bx
• C. B24
• D. Cos

Answer: (A)

In turnout control circuits, each relay is labeled with a short acronym that identifies its function. For the relay that handles the route when the switch is in its normal position, the label used is Bns. That makes Bns the best fit for “Normal switch position route selection relay,” because it directly designates the normal-position route selection role in the control scheme.

The other acronyms correspond to different relays or circuit functions within the same system, so they do not denote the normal-position route selection. Knowing that Bns is the label for this specific relay helps you quickly map diagrams and descriptions to the actual function in the normal state.