Good Minecart

I would like to be able to connect minecarts to have a functional train effect.

I would like that in Minecraft Bedrock, minecarts with explosives explode on violent impact like in Minecraft Java.

I would also like to be able to put a furnace in a minecart so that it moves even without rails. We could arrange it so that other minecarts can be connected behind the one with the furnace (it wouldn’t be able to go up a block unless we place a transition block like: a stair, a slab, layers of snow, etc.).
I am French and 13 years old, so it’s possible I made a lot of mistakes in the translation.
Thank you for your understanding.