Terry,
Parts request is a good thing so I figured train requests might also be good. Here is my want/need list. All are Prewar Early Period Lionel O gauge. Granted most are hard to find but you don't know unless you ask:
800 Dark Green boxcar (upgrade)
800 Tall PENN RR boxcar (upgrade)
800 all Orange clipped corner boxcar
700 Green vent
153 Dark Green with wire handrails
Please email me if you have any of these. Condition is important.
Mike