I have a simple over and under layout around my Christmas tree and I wish the train could run at a more constant speed as it travels around and over the loop. The engine is an Athern Diesel C44-9W with all 12 wheels driven. The power pack is a Tech4 Rail Power 250. When I connect a digital volt meter to the rails I noticed the voltage would drop just below 7 as the train climbs and then on decent the voltage rises to 10.5 before it settles to about 9 on the flat section. All this without changing the throttle. My thought is to have a better regulated voltage so that the speed would be more constant. I think as it climbs the engine draws more amps and the power supply allows the voltage to drop causing a greater drop in speed. Are there any recommendations on a true voltage regulated power supply? Or am I doing something wrong with what I have? I am not really interested in a DCC system as this is a rather basic single track loop.