What type of brake test is required when assuming control of an M3/M7 train?

When assuming control of an M3 or M7 train, a rear end (class 2) brake test is required. This type of brake test verifies that the train's braking system is functioning properly without needing to simulate the full range of brake applications and releases that would typically be performed in a more extensive brake test.

A class 2 brake test focuses on the rear portion of the train, checking that the brakes are not only operational but also responsive in the context of train handling and control. This involves ensuring that air pressure is sufficient and that the brakes engage correctly when activated.

In contrast, a class 1 brake test is more comprehensive and usually conducted in different circumstances, often during initial setups or at the start of service. A full service brake test would require simulating a more extensive braking scenario, which is not necessary for merely taking control of an already functioning train. The initial terminal brake test is performed under different circumstances primarily at a terminal or when the train is first being readied for service. Therefore, the rear end (class 2) brake test specifically fits the requirement for assuming control of the train efficiently and effectively.