Hello everyone. This is my first post here. To shortly describe myself, I'm 27 and pretty new to model trains, N-Scale in particular. I used to run HO trains as a kid almost 20 years ago. I need help with my setup I just built today, a KATO locomotive in particular and I know someone might be able to see right where the problem is. I purchased 4 KATO locos online, all NIB. Two SD90/43MAC's and two AC4400CW's. I test ran them all today after setting up my "Super Tri-R railroad". I noticed that all of my locos, when first run, acted a little sluggish. As I ran them for a few minutes, they got smoother and ran like sewing machines and all seem to be fine, except for one. The one in particular is one of the SD90/43MAC's I have. When I run it, it doesn't seem to accept power as quickly or well as it's twin. It's slower around the track, and just does not perform like my other three. Since it was brand new, I firgure that there would be some break in time, but it just is not performing optimally and like the other three are. I think there may be something the matter with it, but I do not posses the knowledge yet to know what it is. I don't know if it just needs to be run more, oiled or have some maintenance, the wheels cleaned, or the like. Being brand new, I don't understand why it's acting this way and I am a bit dissapointed. It seems to be only about 60% as fast as it's twin. I was hoping to run them in tandem sometime. I am a little hesitant to open it up and oil/grease it, although I am a competant mechanic and am familiar with moving parts. Is it normal for new locomotives to do this? I have to ask myself why the other three are running so well and this one is not. I hope someone might be able to shed some light for me. Thank you.