The rule requiring the bell to be rung when approaching public crossings, including those in locomotive whistle quiet zones, is found under which USOR section?

• A. USOR 502
• B. USOR 416
• C. USOR 408
• D. USOR 410

Answer: (C)

The important rule here is that trains must provide an audible warning when approaching a public crossing, using the bell, and this warning applies even in locomotive whistle quiet zones where the horn may be restricted. That requirement is found in the section that covers warning signals and their use at crossings. In this context, the specific USOR section that addresses bell usage at public crossings (including in quiet zones) is USOR 408. The other sections deal with different topics, so 408 is the right place for the bell at crossings.