- 3-step protection (US): The protection given by a locomotive engineer to an employee working near, between, or under cars to which the locomotive is coupled. Step 1 - independent brake fully applied; Step 2 - reverser in neutral; Step 3 - turn off generator field (and/or notify the ground employee, depending on company-specific rules and locomotive type, that protection is provided).
- 10 wheeler or ten wheeler (US): A steam locomotive with a 4-6-0 wheel arrangement.
- 241 (US): Procession of a train past a stop signal with verbal permission from the dispatcher (derives from Rule 241, which is used to grant such permission under certain rule sets).
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