I’m not sure what is on the CD4-1, the CD-POST is basically the same as the Aurotech/Kline book, & Greenberg’s Book, covering only Postwar. The CD-PRE is the Lionel Prewar only. Considering how often Olsen’s crashes, I bit the bullet and bought the Prewar CD, after getting heavily involved in the Prewar aspect. I considered the purchase as well worth the price.
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