I am generally not a diesel fan, but I have totally had a blast with these units! The sounds are so well done. My wife is amazed I am having so much fun, knowing I am such a steam enthusiast! LGB did a great job with the decoration, power units and the sounds of these engines. I run these with a lab quality 3 amp, 0-30 volt switching mode regulated DC power supply feeding into a 5 amp PIKO throttle.