Before coupling cars together, what must the train operator verify about the couplers?

The train operator must verify that the couplers are both locked and properly attached before coupling cars together. This is essential for ensuring a safe and secure connection between the train cars. A locked and correctly attached coupler will prevent any accidental disconnection during the operation of the train, which is critical for the safety of both the train crew and passengers.

The integrity of the couplers directly affects the operational capability and safety of the train. If they are not locked properly, it could lead to disastrous consequences, such as derailment or separating train cars while in motion. Therefore, the operator's verification step is a crucial safety measure that ensures that all components are functioning as intended before the train begins its journey.

While the condition and maintenance of the couplers, such as lubrication and checks for rust, are also important aspects, the primary focus before coupling should be on their secure connection.