Observe and correct braking effort during the initial period of dynamic brake application. Maximum braking effort is obtained in the 8th Notch at speeds of about 22 to 30 mph depending on locomotive gearing. When a locomotive is equipped with variable range dynamic braking, a series of peak braking efforts will occur down to about 8 mph. Wheelslip warning may occur while in dynamic braking. This indicates wheels are sliding.
Sand is applied automatically to the wheels of sliding unit.
Reduce the throttle position until the warning stops. When necessary, the automatic air brake may be used in conjunction with the dynamic brake. Automatic air brakes will apply on the train but not on the locomotive. If the Automatic Air Brake handle is moved to the emergency position, the dynamic brake is removed and brakes on the locomotive, as well as those on the train, go into Emergency application. The independent air brake must not be used during dynamic braking, to avoid flat spots on the locomotive wheels caused by sliding.