An extension tool is provided to improve operation of handwheels, for example by allowing railroad operators to more safely reach the handbrake wheel of a train car. The tool includes a head with an upper tapered jaw designed to fit against the handwheel rim and particularly to fit the junction of the handwheel spoke and the handwheel rim circumference. The jaw may be a tapered circular rotating block. Below the jaw is a lower block designed to press against the outer circumference of the handwheel rim. The tool may also include a recess for operating a quick release lever on a train car.