A rock drilling rig which is used for drilling at drilling sites (P) and transfer-driven between the drilling sites (P), the rock drilling rig comprising: a movable carrier ; drive equipment for performing the transfer drive of the rock drilling rig ; at least one boom movable in relation to the carrier ; at least one rock drilling machine arranged on at least one boom ; and at least one control unit (C); characterized in that the drive equipment is a combustion-engine-free drive equipment , which drive equipment comprises at least one electric motor (M) and at least one electric control device (S) for affecting the transfer drive ; the rock drilling rig comprises at least one energy storage (B), in which at least electric energy required for the transfer drive may be stored; and at least one liquid cooling system , to which at least one electric component (K) affecting the transfer drive is connected; the control unit (C) is arranged to control the cooling of the electric component (K) connected to the liquid cooling system ; the liquid cooling system comprises means for precooling it before the following transfer drive ; the electric motor (M) serves as a drive motor; there is a fixed mechanical power transmission connection between the electric drive motor (M) and at least one traction wheel ; the electric drive motor (M) is arranged to serve as a generator in the braking during the transfer drive, producing electric energy to the electric system of the rock drilling rig ; the electric system is provided with at least one electric brake resistor for converting surplus electric energy produced during braking into heat; and said brake resistor is connected to the liquid cooling system . a movable carrier ; drive equipment for performing the transfer drive of the rock drilling rig ; at least one boom movable in relation to the carrier ; at least one rock drilling machine arranged on at least one boom ; and at least one control unit (C); characterized in that the drive equipment is a combustion-engine-free drive equipment , which drive equipment comprises at least one electric motor (M) and at least one electric control device (S) for affecting the transfer drive ; the rock drilling rig comprises at least one energy storage (B), in which at least electric energy required for the transfer drive may be stored; and at least one liquid cooling system , to which at least one electric component (K) affecting the transfer drive is connected; the control unit (C) is arranged to control the cooling of the electric component (K) connected to the liquid cooling system ; the liquid cooling system comprises means for precooling it before the following transfer drive ; the electric motor (M) serves as a drive motor; there is a fixed mechanical power transmission connection between the electric drive motor (M) and at least one traction wheel ; the electric drive motor (M) is arranged to serve as a generator in the braking during the transfer drive, producing electric energy to the electric system of the rock drilling rig ; the electric system is provided with at least one electric brake resistor for converting surplus electric energy produced during braking into heat; and said brake resistor is connected to the liquid cooling system . <EOS>