Apparatus for transporting a device along a tower, which comprises a rail susceptible of being fixed to a tower and extended according to a substantially rectilinear guide direction, and a trolley slidably constrained to the rail and adapted to support a device to be transported provided with at least one power cable. The rail comprises at least one hollow shaped profile with elongated form, which is longitudinally extended according to the guide direction between a lower edge thereof and an upper edge thereof, and is provided with an internal surface which defines a guide seat in which the trolley is slidably housed and in which the power cable of the device is susceptible to pass.