Confused about components - parts of a railroad car

I built some actors (a railroad car body and bogies) to prototype track-following behaviour, and I’m now ready to move these into a blueprint, but I’m confused on the difference between Actor Components and spawning actors.What I want to achieve is:

  • A rolling stock blueprint which represents a single carriage or engine if a train
  • A rolling stock contains a body and at least two bogies (wheel assemblies)

The part I’m confused on is whether the body and bogies should be their own blueprints descended from Actor, or if I just need to create ActorComponents for the behaviour and spawn mesh instances for the visuals. I took a look at one of the cars in the sample content but it was made from a skeletal mesh which maybe not what I’m looking for yet (I’m keeping things simple while I’m learning!)