Just discovered today why trains are “stabled” and not parked in train sheds/depots...
Apparently it goes back to the days when people only had the option of horse/horse and cart for travelling, so after their journey the horses were stabled, so when the trains came along, the term was carried over for their use.
There’s a few instances where horse related terminology is carried over to the new variant. I believe there is still a car sales place named Hexham Horseless Carriages.