blue line

I recently bought a Milwaukee Road F7 A and B set used from a seller on ebay. It arrived last night and I was eager to get it on my DC wired layout. Once on the tracks everything worked well, sound and lights, but the locomotive slowed down and sped up as it moved along the tracks. I saw the...

Hi all, I am a HO scale train modeler. I have purchsed BLI UP big boy & also have 2 nos Seuthe # 99 smoke units. Can someone tell me the procedure of instaling it in Big Boy? As from some information , it needs just connect two wires of smoke unit to acess rail current. But my queries...