What does SOP stand for?

• A. Standard Operating Procedure
• B. Operating Clearance
• C. Opposing Move
• D. Insulated Joint

Answer: (A)

SOP stands for Standard Operating Procedure. A Standard Operating Procedure is a formal, written guide that outlines the exact steps to perform a task or operation, ensuring the action is carried out the same way every time. In rail operations, this means crews follow documented procedures for routine tasks like door operations, signaling checks, safety routines, and emergency responses, which helps keep things safe and consistent across shifts. The other options don’t fit because they refer to different concepts or terms that aren’t used to label a set of instructions: an Operating Clearance isn’t the standard name for procedural guides, an Opposing Move isn’t a rail term, and an Insulated Joint is a hardware component (usually abbreviated IJ) rather than a procedure.