Valve train assembly

A valve train assembly comprising:

• a first group of one or more dual body rocker arms and a second group of one or more dual body rocker arms, the first group being configured to control one or more valves of a first cylinder and the second group being configured to control one or more valves of a second cylinder, each of the dual body rocker arms comprising a first body, a second body, and a latching arrangement configured to latch and unlatch the first body and the second body;
• and
• an actuator arrangement external to the dual body rocker arms of the first and second groups configured to control the latching arrangement of each of the dual body rocker arms, the actuator arrangement comprising a shaft comprising a first set of one or more cams configured to control the latching arrangements of the first group of one or more dual body rocker arms and a second set of one or more cams configured to control the latching arrangements of the second group of one or more dual body rocker arms, shapes of the cams of the first set of one or more cams being different from shapes of the cams of the second set of one or more cams so as to control the latching arrangements on a per cylinder basis.