Apparatus for transporting a device along a tower, which comprises: - at least one rail, which is extended, according to a substantially rectilinear guide direction, between a lower end thereof and an upper end thereof, and is provided with fixing means by means of which said rail is susceptible of being fixed to a tower with said upper end placed at the top of said tower; - at least one trolley slidably constrained to said rail, and adapted to support a device to be transported provided with at least one power cable; - movement means mechanically connected to said trolley and actuatable to move said trolley to slide along said rail between a lowered position, in which said trolley is placed at the lower end of said rail, and a raised position, in which said trolley is placed at the upper end of said rail in order to arrange said device at the top of said tower; said rail comprising at least one hollow shaped profile with elongated form, which is longitudinally extended according to said guide direction between a lower edge thereof and an upper edge thereof, and is provided with an external surface and an internal surface which defines a guide seat in which said trolley is slidably housed and in which the power cable of said device is susceptible to pass; said trolley comprising a support bracket provided with a projecting portion to which said device is susceptible to be fixed; said projecting portion being extended outside the guide seat of said shaped profile through a longitudinal slit obtained on said shaped profile and being extended parallel to said guide direction; wherein said movement means comprise at least one pulley provided with an actuation device arranged at the lower end of said rail, with a transmission pulley fixed at the upper end of said rail, and with a drive rope supported on said transmission pulley, and provided with a first end constrained to said actuation device and with a second end fixed to said trolley; said drive rope being provided with a first section being extended parallel to said guide direction between said actuation device and said transmission pulley, and with a second section (44") being extended parallel to said guide direction between said transmission pulley and said trolley; said apparatus being characterized in that the shaped profile of said rail is provided with at least one first passage seat being extended in a through manner between the lower edge and the upper edge of said shaped profile according to said guide direction, and housing therein the first section of said drive rope. - at least one rail, which is extended, according to a substantially rectilinear guide direction, between a lower end thereof and an upper end thereof, and is provided with fixing means by means of which said rail is susceptible of being fixed to a tower with said upper end placed at the top of said tower; - at least one trolley slidably constrained to said rail, and adapted to support a device to be transported provided with at least one power cable; - movement means mechanically connected to said trolley and actuatable to move said trolley to slide along said rail between a lowered position, in which said trolley is placed at the lower end of said rail, and a raised position, in which said trolley is placed at the upper end of said rail in order to arrange said device at the top of said tower;