We've been having a discussion about static grass on another thread, so have a look through, it may help.
To make a short story long, the money I was going to use towards a $70 static grass applicator I spent on roses for my wife's 75 birthday (she's been so good putting up with the messes and helping on the layout). So, in lieu of an applicator, can I use a battery power DeWalt shop vac to make the...
modelrailroadforums.com
Are you asking where to get replacement wheels and trucks, depending on what you want simply google them. BUT before you start paying out, can I ask what have you checked on the track, ie. is the track level in the places your loco has problems on? have you checked the wheel gauge on the trucks ? are there gaps between track pieces? are both sides of the track level on a join? all these can cause problems, and are simple fixes.