Final answer:
The critical speed must not be exceeded when handling a Multiple Unit consist with no cars to prevent derailment.
Step-by-step explanation:
In order to handle a Multiple Unit consist with no cars, the speed must not exceed the critical speed. This critical speed is the minimum speed at which the cars will not separate from each other due to the centrifugal force. If the speed exceeds the critical speed, the cars will tilt and potentially derail.
For example, if a train is traveling around a curve, the critical speed is determined by the radius of the curve and the coefficient of friction between the wheels and the track. If the speed of the train exceeds the critical speed, the cars will derail.
Therefore, it is important to ensure that the speed of a Multiple Unit consist with no cars does not exceed the critical speed to maintain stability and prevent derailment.