It's always been my experience that each time I add a locomotive to a mutiple unit train on a DC system, each locomotive loses power. I think it's because of the amps each additional locomotive draws. If I'm correct, is there anything I can do to increase amps besides buy a stronger/better power pack? I have 4 power packs. Could I increase amps by connecting multiple power packs to the same track? I definitely don't know enough about electricity to know if that's a possible/safe solution.