I have a web article about making a 55n3 caboose from a Bachmann On30 caboose at:
http://www.55n3.org/cars/convert_caboose/ (http://www.55n3.org/cars/convert_caboose/)
(http://www.55n3.org/cars/convert_caboose/image/005050_end_view.jpg)
The same principle can be applied to the Bachmann On30 Passenger cars to make them 55n3.
Thank you if you visit
Harold