context: The system for controlling the current through the TED rheostat-contactor (RKSU) non-automatic indirect (the so-called group rheostat controller). All switching power circuits from brake braking resistances and TED are performed by the driver through the controller controlled by pedals. The controller contains reverse, starting and braking subsystems. During their travel, the pedals close and open the service control circuits with a voltage of 100 V. Contactors are connected to these circuits, which switch the starting braking resistances in the TED power circuit. Thus, a certain separation of the driver from high-current circuits is organized in order to increase electrical safety. The controller has a special locking system that excludes contactor closure options, leading to the passage of excessive currents through the TED and brake braking as a result of clearly incorrect actions by the driver (for example, simultaneously depressing the travel and brake pedals). Starting brakes limit the current through the TED, thus controlling its rotation speed and the developed torque. In the braking mode, the RKSU forms a closed circuit disconnected from the contact network from a TED (operating in the mode of an electric generator) and braking resistors included as a load. The current arising in this circuit creates countercurrent magnetic fluxes inside the stator and rotor windings of the TED, leading to the appearance of a mechanical moment of force tending to stop the rotation of the rotor. Thus, electrodynamic braking of the trolleybus is realized. MTB-82 has a limited possibility of regenerative braking - the TED connection at the last running position is organized so that when exceeding the maximum speed of 55 km / h (for example, when driving downhill) it cannot exceed a certain angular speed rotation and gives off excess energy to the contact network. Thus, it stabilizes the speed of the trolley at the maximum mark, braking it when it is exceeded.
question: What is the maximum speed of MTB-82?
answers.text: 55 km / h