This should bring a snicker to you, free of charge. I have all the Santa Fe's of post war era, they are all great. I found a pair of 2333's in beat up condition and they lacked pulling power of my first set,,,,,so what did I do,you say.?
I glued a pair of rubber tires to the 33's and let them set well, I put the rubber tires on both motors trucks same side too, because this raised the trucks a tiny bit. Now they really pulled as good or better than their brothers. I did not grove the wheels.
Remember this is food for thought or laughter. By the way,I did this in the 1960's, still running today.
Rod