Does anyone know Marx trains E7 units minimum radius? Also are there any ways to convert their couplers to postwar couplers?
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All my Marx diesels run just fine (for some values of "fine"!) on O-27 track. Dunno about changing couplers, though . . . 
The Robert Grossman Co makes a Marx to Lionel coupler adapter. See item 357 in the coupler section.
As Steve Tyler said, any radius is ok. As a kid, I ran them on O27 with no problem. I never tried to change the coupler on the engine. I used a "transition" car where I replaced a Marx truck/couple on one end a gondola with a Lionel truck/coupler. Yeah, the truck profiles didn't match, but as a kid, it didn't matter and allowed me to run both Marx and Lionel cars in the same train.
Thanks to all for the info. Very helpful! I probably shouldn't have used the word "change" the coupler. All I want is to be able to pull some lionel cars. Sounds like the adapter or making a transition car will both work out great!
