A method of automatically articulating a powered ambulance cot, comprising: supporting the patient on a powered ambulance cot, said cot comprises a support frame provided with a pair of front load wheels and supporting the patient, a pair of front legs each having a front wheel and an intermediate load wheel, a pair of back legs each having a back wheel, a cot actuation system having a front actuator which moves together the pair of front legs and which interconnects the support frame and the pair of front legs, and a back actuator which moves together the pair of back legs and which interconnects the support frame and the pair of back legs, and a cot control system operably connected to the cot actuation system to control raising and lowering of the pair of front legs and the pair of back legs independently, and which detects a presence of a signal requesting a change in elevation of said support frame to cause the cot actuation system to move either or both pairs of the front and back wheels relative to the support frame via the raising or the lowering of the pair of front legs and/or the pair of back legs; and characterized in that the method is for transporting a patient up or down a moving escalator (504, 506) and the method further comprises rolling the cot onto the moving escalator (504, 506), wherein the control system automatically retracts or extends the front legs to maintain the support frame level relative to gravity as the escalator (504, 506) moves up or down. supporting the patient on a powered ambulance cot, said cot comprises a support frame provided with a pair of front load wheels and supporting the patient, a pair of front legs each having a front wheel and an intermediate load wheel, a pair of back legs each having a back wheel, a cot actuation system having a front actuator which moves together the pair of front legs and which interconnects the support frame and the pair of front legs, and a back actuator which moves together the pair of back legs and which interconnects the support frame and the pair of back legs, and a cot control system operably connected to the cot actuation system to control raising and lowering of the pair of front legs and the pair of back legs independently, and which detects a presence of a signal requesting a change in elevation of said support frame to cause the cot actuation system to move either or both pairs of the front and back wheels relative to the support frame via the raising or the lowering of the pair of front legs and/or the pair of back legs; and a support frame provided with a pair of front load wheels and supporting the patient, a pair of front legs each having a front wheel and an intermediate load wheel, a pair of back legs each having a back wheel, a cot actuation system having a front actuator which moves together the pair of front legs and which interconnects the support frame and the pair of front legs, and a back actuator which moves together the pair of back legs and which interconnects the support frame and the pair of back legs, and a cot control system operably connected to the cot actuation system to control raising and lowering of the pair of front legs and the pair of back legs independently, and which detects a presence of a signal requesting a change in elevation of said support frame to cause the cot actuation system to move either or both pairs of the front and back wheels relative to the support frame via the raising or the lowering of the pair of front legs and/or the pair of back legs; and characterized in that the method is for transporting a patient up or down a moving escalator (504, 506) and the method further comprises rolling the cot onto the moving escalator (504, 506), wherein the control system automatically retracts or extends the front legs to maintain the support frame level relative to gravity as the escalator (504, 506) moves up or down.