What aspect of torque is critical during an escalator's initial movement?

During an escalator's initial movement, breakaway torque is critical because it is the amount of torque required to initiate movement from a stationary position. This concept is particularly important for escalators because they must overcome static friction between the mechanical components and any load present before beginning to operate. Once the escalator is in motion, the dynamic characteristics of torque become more relevant, but during the initial movement, the ability to generate sufficient breakaway torque ensures that the escalator can effectively transition from rest to motion. It prevents stalling and ensures a smooth start, which is crucial for the safety and performance of the escalator system.