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The MRL elevators (Machine Room Less) are without any machine room.
They can either have electric traction or hydraulic traction.
The hoisting machine, positioned in the headroom, inside the elevator shaft, can be of the  ‘classical asynchronous’  type or the ‘permanent magnet without a reduction gear’ type.

The control panel is usually placed on the top floor next to the entrance door, or alternatively in the elevator shaft inside the door frame of the floor, for the section on emergency maneuver.
As a machine room is not necessary, a considerable saving of space is obtained and as the machine is inside the hoistway, the entire load rests on the car guide rails and the counterweight, thus eliminating the need for supporting structures or any other specific construction work.
The cabinet containing the control panel is small thus it minimizes aesthetic impact.

For MRL elevators, and also ‘traditional electric elevators’, the control of the engines by variable speed drives allows considerable driving comfort, pinpoint accuracy of stops, silence in the cab and in the building.
Moreover, the use of MRL elevators allows considerable savings of energy, thanks to the optimal management of electricity and to a significant reduction of electromechanical stress.

The possibility of arranging the control equipment and the power unit (ECU) in any position allowed the hydraulic systems to develop the MRL (Machine Room Less) solution in a simple way. The use of special cabinets containing the control panel, the distribution panel and the control unit is very widespread.