A method for automatically articulating an electric ambulance stretcher (10), comprising: supporting the patient on an electric ambulance stretcher (10), said stretcher comprises a support frame (12) provided with a pair of front loading wheels ( 70) and supporting the patient, a pair of front legs (20) each having a front wheel (26) and an intermediate load wheel (30), a pair of rear legs (40) each having a rear wheel ( 46), a stretcher drive system (34) having a front actuator (16) that moves together the pair of front legs (20) and interconnects the support frame (12) and the pair of front legs (20 ), and a rear actuator (18) that moves together the pair of rear legs (40) and interconnects the support frame (12) and the pair of rear legs (40), and a stretcher control system that is operatively connects to the stretcher drive system (34) to control the raising and lowering the pair of front legs (20) and the pair of rear legs (40) independently, and detecting the presence of a signal requesting a change in the elevation of such a support frame (12) to make the Stretcher drive system moves one or both pairs of the front wheels (26) and the rear wheels (46) relative to the support frame (12) through the raising or lowering of the pair of the front legs (20) and / or the pair of hind legs (40)； and characterized in that the method is to transport a patient up or down a moving escalator (504, 506) and the method further comprises rolling the stretcher over the escalator (504, 506), where the control system automatically retracts or extends the front legs (20) to maintain the level of the support frame (12) relative to gravity as the escalator (504, 506) moves up or down.Un método para articular automáticamente una camilla eléctrica de ambulancia (10), que comprende: soportar al paciente en una camilla eléctrica de ambulancia (10), dicha camilla comprende un bastidor de soporte (12) proporcionado con un par de ruedas de carga frontales (70) y que soportan al paciente,
