Abstract: An end dogging sawmill carriage is described, including a pair of front and rear carriage units having dogs which engage the opposite ends of a log and a pair of independent drives for such carriage units. The pair of drives are temporarily connected together by a releasable connector means to maintain the log clamped between the carriage units as such pair of drives share the load and both drive the log through the primary breakdown log cutting apparatus. The releasable connector can by a cylinder actuated cable clamp mounted on the rear carriage unit for clamping the first drive cable of the front carriage unit in response to an electrical control signal applied to a solenoid valve for operating the clamp cylinder. In another embodiment the releasable connector is a solenoid actuated lock which operates a latch member to selectively engage one of a plurality of notches spaced along a notched connecting rod attached between the end of the first cable and the front carriage.