Driving wheel
（重定向自Driving axle）
![The driving wheels (boxed) on a 4-6-2 locomotive.](/Images/godic/202501/10/462driving1005.jpg")
![Traction motor for a German locomotive](/Images/godic/202501/10/Traction_motor_german-class1401005.jpg")
![The four driving wheels on one side of a 4-8-4 locomotive.](/Images/godic/202501/10/MILW_261_drivers1005.jpg")
![One of six 6 ft 8 in (2.03 m) driving wheels belonging to 60163 Tornado](/Images/godic/202501/10/60163_Tornado_wheel1006.JPG")
On a steam locomotive, a driving wheel is a powered wheel which is driven by the locomotive's pistons (or turbine, in the case of a steam turbine locomotive). On a conventional, non-articulated locomotive, the driving wheels are all coupled together with side rods (also known as coupling rods); normally one pair is directly driven by the main rod (or connecting rod) which is connected to the end of the piston rod; power is transmitted to the others through the side rods.