When coupling cars, what speed should they approach each other?

When coupling railroad cars, approaching each other at a speed of one mile per hour is considered the safest and most effective speed. This slow speed allows for better control during the coupling process and minimizes the risk of damage to the cars and their couplers, which are designed to absorb the impact of the connection. At this speed, train operators can ensure that they can promptly react to any unexpected situations that may arise during the coupling, which helps maintain safety and operational efficiency.

Higher speeds, such as two, three, or four miles per hour, increase the likelihood of rough coupling events, which can lead to misalignment, damage, or even derailments. Consequently, the one mile per hour speed limit ensures that the coupling is performed smoothly, maximizing safety for both the equipment and crew involved. Recognizing this key factor in coupling operations is crucial for any train operator.