A powertrain for a road sweeping vehicle comprising: a power unit operably connected to a primary gearbox; and a hydrostatic gearbox comprising: a casing having an internal volume and comprising first and second sections (51, 52) and a plurality of passageways (106, 107), wherein the first and second sections (51, 52) each comprise walls (54, 55, 56, 57, 80, 81, 82, 83) having edges, the first and second sections (51, 52) being fastened together at the edges, and each passageway (106, 107) extends through the walls (56, 57, 82, 83) and is defined by the edges of both the first and second sections (51, 52); an input shaft having an integral gear extending orthogonally therefrom and having an outer portion extending outside of the internal volume of the casing; an output shaft selectively engageable with the input shaft; a pump drive shaft operable to be driven by the input shaft gear; and a motor driven shaft operable to drive the output shaft, wherein the shafts (112, 133, 161, 181) extend within the casing and are each mounted in one of the passageways (106, 107), said powertrain further comprising: a first mounting arrangement connected to the output of the primary gearbox and located on the outer portion of the input shaft; a second mounting arrangement connected to a drivetrain and located on the output shaft; a hydraulic motor drivably connected to the motor driven shaft; and at least one hydraulic pump drivably connected to the pump drive shaft and hydraulically connected to one or more road cleaning tools and/or the hydraulic motor. a power unit operably connected to a primary gearbox; and a hydrostatic gearbox comprising: a casing having an internal volume and comprising first and second sections (51, 52) and a plurality of passageways (106, 107), wherein the first and second sections (51, 52) each comprise walls (54, 55, 56, 57, 80, 81, 82, 83) having edges, the first and second sections (51, 52) being fastened together at the edges, and each passageway (106, 107) extends through the walls (56, 57, 82, 83) and is defined by the edges of both the first and second sections (51, 52); an input shaft having an integral gear extending orthogonally therefrom and having an outer portion extending outside of the internal volume of the casing; an output shaft selectively engageable with the input shaft; a pump drive shaft operable to be driven by the input shaft gear; and a motor driven shaft operable to drive the output shaft, wherein the shafts (112, 133, 161, 181) extend within the casing and are each mounted in one of the passageways (106, 107), a casing having an internal volume and comprising first and second sections (51, 52) and a plurality of passageways (106, 107), wherein the first and second sections (51, 52) each comprise walls (54, 55, 56, 57, 80, 81, 82, 83) having edges, the first and second sections (51, 52) being fastened together at the edges, and each passageway (106, 107) extends through the walls (56, 57, 82, 83) and is defined by the edges of both the first and second sections (51, 52); an input shaft having an integral gear extending orthogonally therefrom and having an outer portion extending outside of the internal volume of the casing; an output shaft selectively engageable with the input shaft; a pump drive shaft operable to be driven by the input shaft gear; and a motor driven shaft operable to drive the output shaft, wherein the shafts (112, 133, 161, 181) extend within the casing and are each mounted in one of the passageways (106, 107), said powertrain further comprising: a first mounting arrangement connected to the output of the primary gearbox and located on the outer portion of the input shaft; a second mounting arrangement connected to a drivetrain and located on the output shaft; a hydraulic motor drivably connected to the motor driven shaft; and at least one hydraulic pump drivably connected to the pump drive shaft and hydraulically connected to one or more road cleaning tools and/or the hydraulic motor. a first mounting arrangement connected to the output of the primary gearbox and located on the outer portion of the input shaft; a second mounting arrangement connected to a drivetrain and located on the output shaft; a hydraulic motor drivably connected to the motor driven shaft; and at least one hydraulic pump drivably connected to the pump drive shaft and hydraulically connected to one or more road cleaning tools and/or the hydraulic motor.