What device is used for uncoupling cars on the R44 and R46?

The electro-pneumatic uncoupling package is the correct device used for uncoupling cars on the R44 and R46. This system utilizes a combination of electrical and pneumatic mechanisms to facilitate the uncoupling process, which provides efficiency and reliability in operations. The electro-pneumatic setup allows for a smooth operation that minimizes the physical effort required and reduces the risk of mechanical failures compared to purely manual systems.

Using this advanced technology helps train operators manage the coupling and uncoupling of train cars with more precision, contributing to overall safety and operational efficiency. In contrast, other devices like mechanical uncoupling levers or manual uncoupling tools might not provide the same level of effectiveness in such modern trains, while an automatic uncoupling system might suggest a different operational mechanism not specifically utilized in these models.