Gsgood,
You absolutely need to buy the Legacy 993 Cab-2 and base. The ZW-L will not replace this. The 993 base IS the Legacy brain.
The ZW-L is an amazing transformer but your postwar ZW will work just fine. I would also recommend a powerhouse lockon to each track or some other form of fast acting fuse as the postwar ZW has very slow fuses that will fry your locomotives before they trip.
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