Revoke Shunt Route Button
Sometimes is it necessary to manually dissolve a route. This process is called "revoking a route" and in the case of train routes, is achieved using the FRT button.
To revoke a shunt route, first press FRT. Then, press the start and end signal buttons together. Always use the same two buttons as used when the route was first set. When successful, the start signal will drop to stop and the route will disappear.