Atlas O has already offered replacement frames, for separate sale. There has already been at least one posting covering how the person used the new Atlas replacement underframe to "prepare" his damaged Weaver cars. I had one of my 3 cars break the underframe completely, while the other 2 I carefully disassembled and ground material off each end of the underframe (one of my buddies made me a new underframe out of styrene for the 3rd basket case car).
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