New at this

[sammybky]

I bought my 9 year old a starter set for Christmas.  HO scale.  It has two engines.  One runs great.  The other is a bit "sluggish".  I feel like the wheels/axles need lubrication but not sure if that's it or what to use if it is.  Any advice?  Thanks, Sam

[ACY]

Don't apply lubrication to the wheels, you can clean them however. Try applying some grease in the gears, although from the factory it is usually adequately lubricated.

[jbrock27]

More details may produce a little more assistance.  What set is this?