Which part of the escalator contains the motor and drive unit?

The correct answer is the machinery space, as this is the designated area where the motor and drive unit of the escalator are housed. The machinery space is critical for the functioning of the escalator, as it contains not only the motor that powers the escalator but also the gear system and other essential components that contribute to its operation.

The layout and design of an escalator require the motor and drive unit to be situated away from passenger areas for safety and noise reduction, which is a primary reason these components are located in the machinery space. This separation ensures that users of the escalator are not exposed to the mechanical parts and any potential hazards that they might pose.

In contrast, the platform area is where passengers enter and exit, and it does not contain mechanical components. The handrail support is primarily involved in the safety and guidance of passengers and does not house major electrical or mechanical equipment. The step area is where the escalator travels and carries passengers, but it is also not where the motor or drive unit is located. Thus, focusing on the functions and designs of escalators reveals that the machinery space is indeed the correct and logical answer for the location of the motor and drive unit.