By increasing the number of notches on the speed controller, and fitting more motors, acceleration of the new trains was around per second, an increase from per second on the Standard Stock. Braking rates were also improved to per second by fitting each brake block with its own cylinder, and using a retardation controller to control the brake pressure. This allowed higher pressure to be applied at faster speeds, and the pressure to reduce as the speed dropped, to maintain a constant rate of deceleration without wheel slip.