I don't know if the O22 switches develop the same problems as the 1122E switches I use BUT here's what corrected my derailing. Parts get worn out from the wheels crossing over at the switch, my wheels would run off. In this photo you'll see I used JB weld on 3 places. 1) the frog...2)the middle finger at the center rail and 3) by the inner curve. These worn out spots allowed the wheels to "run straight" and derail. Hope this helps.
