Which acronym was used for Normal switch position route selection relay?

• A. Bx
• B. B24
• C. Bns
• D. Cos

Answer: (C)

In signaling practice, the names of relays often encode what they control. For a relay that sets or confirms the route when a turnout is in its normal (straight) position, the suffix ns is used to indicate Normal Switch. The leading B typically designates the block or relay family involved in route selection. So Bns specifically names the relay that handles the Normal switch position route selection, making it the best fit for this function.

The other options don’t reflect the Normal Switch route selector. They either point to different relay functions or use a naming that doesn’t indicate the normal-position route selection, which is why they aren’t appropriate for this role.