Can rapido N scale locomotive coupler be replaced with a knuckle coupler?
Probably. What loco in particular do you want to convert? If you go to the Micro Trains website, they have a conversion chart that will tell you which one of their couplers will fit into any number of locomotives. Even if you don't find an exact replacement, usually you can modify one to fit. Pilot couplers on some steam locomotives can be really tricky, though.
I did not know until today, that Micro Trains and Kadee were owned by brothers. The spilt the companies between them.
Henry
COB Potomac & Northern
Shenandoah Valley
I want to replace repido on Kato loco's.
https://www.micro-trains.com/index.php?route=information/information&information_id=10
Click on this link and it should take you to the conversion chart on the Micro Trains website. Click on either PDF or Excel, look to see what type of locomotive you have, and the chart will provide you with the replacement MT knuckle coupler.
Hope this helps.
Scott