I recieved this loco from my sister for Christmas. When I run it on my DC layout, it makes a lot of noise....a low whirring/rumbling sound with a lot of vibration. My son an I installed the dummy plug thinking this might have something to do with it but it didn't help. My Atlas loco is nice and quiet in comparison. Anyone have any ideas what's going on? Maybe I just got a lemon and will have to send it back.