Before I start and you ask, this is for N scale. :thumb: I am in the process of finally building my layout. It's been probably four years since I last ran my locos. What maintenance tips does this members a large recommend? Do I need to oil them or add grafite or what ever? Here is why I ask. I have 5 Kato cw44-9's (digitrax dcc) and two Kato sd-45's (non dcc). On a test track, my sd-45's ran fine. Two of the cw44's ran stiff, but loosen up after a few minutes. Two others were non responsive, ie I was not able to get them to program and run.as the other two did. Should I try these two with an old transformer to see if they do run at all? I did not try the other loco, but will tonight if I get time. All of these units ran the last time I had a layout and have been store in their original boxes inside of a large tackle box. Thanks in advance.