Valve train assembly

A valve train assembly, comprising:

• a first group of one or more rocker arms and a second group of one or more rocker arms, each of the first group of one or more rocker arms and each of the second group of one or more rocker arms comprising a respective latch pin and a respective first biasing means biasing the respective latch pin to an unlatched state, wherein the first group of one or more rocker arms is configured to control one or more first valves of a first cylinder and the second group of one or more rocker arms is configured to control one or more second valves of a second cylinder,
• wherein each of the first group of one or more rocker arms and each of the second group of one or more rocker arms is configured to switch between a latched state and the unlatched state,
• wherein the first group of one or more rocker arms comprises one or more further first rocker arms configured to control one or more additional first valves of a third cylinder,
• wherein the second group of one or more rocker arms comprises one or more further second rocker arms configured to control one or more further second valves of a fourth cylinder,
• wherein the valve train assembly is configured such that the first and third cylinders are controlled by the first group of one or more rocker arms, and the first and third cylinders are consecutive to the second and fourth cylinders controlled by the second group of one or more rocker arms;
• and
• an actuator arrangement drivable by an actuator, the actuator arrangement comprising:
• a respective first selector cam for each of the first group of one or more rocker arms, each of the first selector cams being movable to select among first sector positions, wherein the first sector positions comprise:
• abutting one of two first base circle portions against a respective latch pin to maintain the first group of one or more rocker arms in the unlatched state;
• and
• abutting a first lobed portion against the respective latch pin to maintain the first group of one or more rocker arms in the latched state;
• and
• a respective second selector cam for each of the second group of one or more rocker arms, each of the second selector cams being movable to select among second sector positions, wherein the second sector positions comprise:
• abutting one of two second lobed portions against a respective latch pin to maintain the second group of one or more rocker arms in the latched state;
• and
• abutting a second base circle portion against the respective latch pin to maintain the second group of one or more rocker arms in the unlatched state.