Describe the Suggestion

There could be a feature where you could select whether you want a train to be a locomotive or a railcar when creating a train. Afterwards, there could be a crowbar type tool used to couple up railcars to a main locomotive. Additional cars that were a part of a locomotive beforehand cannot be decoupled (as in, multiple cars in a locomotive).
You can couple up railcars by right clicking on one bogey then another. Then, it can be decoupled by right clicking one of the already coupled bogies.

Screenshots and Videos

No response

Additional Context

I think this feature would be pretty useful so you can use one locomotive to take multiple different types of trains instead of having to create a brand new locomotive every time you need a new train.

You can disassemble the train and pick your carts with another contraption. For example with a sticker on a pulley. place it somewhere else, and put another cart in place. There is a recent video on youtube about this