How many truck cutouts are there on M-3 cars?

Answer: B — Two per car

M-3 cars are equipped with a total of two truck cutouts on each car. These truck cutouts serve an important purpose in the air brake system and train dynamics. Specifically, they are designed to separate the air brake system of each truck, allowing for heightened control and improved safety during operation. Having two cutouts means that if there is an issue with one truck's air brake system, the other can still function independently, ensuring that the train can operate safely and efficiently. This arrangement is crucial for maintaining operational integrity, especially in situations that may require quick responses to potential brake failures or malfunctions. In the context of the M-3 cars, this configuration enhances overall reliability and contributes to the effective management of braking forces across the train.