The correct answer is: None of these
EMU trains do not have couplings. Couplings are used to connect two or more railway vehicles together. They are typically located at the ends of the vehicles and are designed to allow the vehicles to move together as a single unit.
EMU trains are powered by electricity and do not have engines. This means that they do not need to be connected to each other in order to move. Instead, they are connected to an overhead power line that provides them with electricity.
The lack of couplings on EMU trains has several advantages. First, it makes them lighter and more efficient. Second, it allows them to be operated more flexibly. For example, they can be easily added to or removed from a train set, which makes them ideal for use on commuter lines.
Finally, the lack of couplings makes EMU trains safer. This is because there is no risk of the vehicles becoming disconnected and derailing.
In conclusion, EMU trains do not have couplings. This is because they are powered by electricity and do not need to be connected to each other in order to move. The lack of couplings has several advantages, including making the trains lighter, more efficient, and safer.