hey zyo2019,
Pretty sure they must get this topic alot, first topic in the FAQ is about this :)
FAQ
Q: Loaders are too /cheap/ugly/expansive/cheaty/pretty/easy, don't use power and don't work with the trains! BUG!!!!!!!!
A: Just turn off this in the game settings. And stop asking about it. PLEASE! Loaders use a vanilla algorithm and cannot consume energy and work with trains. This is a decision of the developers of the game, not ours, and we can’t add it. These are the limitations of the game. We cannot do whatever we want. Understand this already at last. If you want the loaders to use electricity, then install this mod: Miniloader. This mod masks inserters into loaders.
Also this mod is good too: Bulk Rail Loader.