Wind turbine

A wind turbine comprising a hub carrying a plurality of blades, the hub being rotatably mounted on a frame, the frame extending forward into the hub, wherein the frame comprises a manhole arranged in an upper side of the portion of the frame extending forward into the hub, and further comprising a transport system arranged in a lower portion of the frame extending forward into the hub, the transport system comprising one or more rails that extend to at least the manhole and a trolley movable along the rails for moving wind turbine components received through the manhole out of the hub or moving wind turbine components through the frame to the manhole a nacelle comprising a slewing crane positioned to receive the wind turbine components from the trolley or to place the wind turbine components on the trolley, wherein the crane comprises a circular base structure attached at a roof of the nacelle, a beam movably mounted about on the base structure so as to move around the base structure relative to a vertical rotation axis through a center region of the base structure, and a hoist movably arranged on the beam.