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This paper investigates the voltage rise due to the regenerative braking of the dc machines associated with the gantry crane. Manipulation of a crane for precisely positioning the container has to operate so fast in order to keep cargo ship punctuality. The major components in a crane of a harbour container centre are the hoist and trolley which are energised by dc motors in this paper. When the dc machines are operating in the regenerative braking mode, it will act as generators and feed a little active power back to the electric system. Such an operating mode sometimes causes unwanted terminal voltage rising up. Extensive computer simulations are executed to illustrate and analysis the phenomena. Some results are obtained at the end of this paper to get rid of the unwanted voltage rise.