Within interlocking limits, what is the maximum speed under NORAC Rule 80?

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Multiple Choice

Within interlocking limits, what is the maximum speed under NORAC Rule 80?

Explanation:
Interlocking limits are zones around signals and switches where trains must move slowly to ensure safe observation and operation of the interlocking equipment. NORAC Rule 80 specifies the maximum speed within those limits to keep trains under tight control as they approach signals and interlocking devices. Inside interlocking limits, you may not exceed 15 mph, which provides enough margin to stop if a signal changes or a switch is not properly aligned. The other speeds listed are either applicable outside interlocking or simply exceed the safety margin required inside interlocking limits, which is why they’re not correct for this scenario.

Interlocking limits are zones around signals and switches where trains must move slowly to ensure safe observation and operation of the interlocking equipment. NORAC Rule 80 specifies the maximum speed within those limits to keep trains under tight control as they approach signals and interlocking devices. Inside interlocking limits, you may not exceed 15 mph, which provides enough margin to stop if a signal changes or a switch is not properly aligned.

The other speeds listed are either applicable outside interlocking or simply exceed the safety margin required inside interlocking limits, which is why they’re not correct for this scenario.

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