OK re:lubing (Note: I’d place more importance on doing this FIRST before adding smoke to the smokestack).
Starting with the front/pilot truck - Oil sparingly (ie. 1 or 2 drops) the axles and just put a small dab of grease UNDER the center screw as it’s a pivot point. (Note: This also applies to the trailing truck)
Next, the 2 center screws - where it says to add Grease - allows access to the internal gearing so you remove the screws, add a small amount of grease, then reinstall the screws.
Apply 1 or 2 drops of oil to all the Drive Wheel axles/bushings as well as all of the side rods and linkages. Otherwise you’ll probably hear squeaks when a 21 yr old engine is running. 😜 As Pat (aka Harmon Yards) likes to say, basically lubricate any moving parts to reduce friction - but sparingly!
Enjoy!