A gearbox to be fixed to a turbomachine in order to drive at least one piece of equipment annexed to the turbomachine, comprising a casing, a drive train internal to the casing and comprising a series of gears, as well as a drive member intended to mesh with a transmission shaft of the turbomachine, with the casing comprising fastening points to the turbomachine and to the equipment, wherein the drive train comprises at least two gear lines located in non-parallel planes and connected together by a junction gear to a junction interface, comprised of a pair of gear wheels with non-parallel axes, of which, at least one end line housed in an end casing branch that has a main extension in a substantially axial direction of the turbomachine when the box is fixed to the turbomachine, and another line, housed in an intermediate casing branch, the intermediate casing branch being curved in a portion of a circle, substantially perpendicular to the end branch and which surrounds a portion of circumference of the turbomachine when the box is fixed to the turbomachine, wherein said another line belongs to an essential transversal plane of the turbomachine.