A valve train assembly comprising an exhaust valve rocker arm assembly selectively opening first and second exhaust valves and comprising: an exhaust rocker arm ; and a valve bridge operably associated with the rocker arm and including a main body , the main body configured to engage the first exhaust valve , the valve train assembly further comprising an engine brake rocker arm assembly comprising an actuator assembly ; characterized by : the valve bridge comprising a lever rotatably coupled to the main body of the valve bridge ,); wherein the engine brake rocker arm assembly comprises an engine brake rocker arm which is configured to rotate the lever to open the second exhaust valve , and wherein the actuator assembly is coupled to the engine brake rocker arm and wherein the actuator assembly is movable between a retracted position and an extended position, wherein in the retracted position the actuator assembly does not engage the lever , and in the extended position the actuator assembly selectively engages the lever. an exhaust rocker arm ; and a valve bridge operably associated with the rocker arm and including a main body , the main body configured to engage the first exhaust valve , the valve train assembly further comprising an engine brake rocker arm assembly comprising an actuator assembly ; characterized by : the valve bridge comprising a lever rotatably coupled to the main body of the valve bridge ,); wherein the engine brake rocker arm assembly comprises an engine brake rocker arm which is configured to rotate the lever to open the second exhaust valve , and wherein the actuator assembly is coupled to the engine brake rocker arm and wherein the actuator assembly is movable between a retracted position and an extended position, wherein in the retracted position the actuator assembly does not engage the lever , and in the extended position the actuator assembly selectively engages the lever. the valve train assembly further comprising an engine brake rocker arm assembly comprising an actuator assembly ; characterized by : the valve bridge comprising a lever rotatably coupled to the main body of the valve bridge ,); wherein the engine brake rocker arm assembly comprises an engine brake rocker arm which is configured to rotate the lever to open the second exhaust valve , and wherein the actuator assembly is coupled to the engine brake rocker arm and wherein the actuator assembly is movable between a retracted position and an extended position, wherein in the retracted position the actuator assembly does not engage the lever , and in the extended position the actuator assembly selectively engages the lever. the valve bridge comprising a lever rotatably coupled to the main body of the valve bridge ,); wherein the engine brake rocker arm assembly comprises an engine brake rocker arm which is configured to rotate the lever to open the second exhaust valve , and wherein the actuator assembly is coupled to the engine brake rocker arm and wherein the actuator assembly is movable between a retracted position and an extended position, wherein in the retracted position the actuator assembly does not engage the lever , and in the extended position the actuator assembly selectively engages the lever. <EOS>