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Lionel had 4 B-Units advertised with 'FatBoy" speakers, that were PWC with TMCC.

They specifically state "Discover the exciting realism of the breakthrough LEGACY RailSounds real-time “quilling” horn and laboring effects with these all-new LEGACY RailSounds B-units. Add LEGACY RailSounds features to your favorite Postwar Celebration Series F3 engine sets!".

However, there are some non-PWC AA sets that have the same specifications to the PWC ones.

My question is, can I use these "FatBoy" B-Units for non PWC as long as the technical specs are the same, despite it being a non "PWC" item?

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The PWC thing really only referred to the fact that the decor of the engines and cars was the same as the Postwar version. It has nothing to do with the chassis or electronics of the unit. There is no difference between any of the TMCC engines offered by Lionel and a PWC engine other than the paint on the shell. You can run those Legacy B units with anything that's running on a Command (18v) layout. You can run them with a TMCC or Legacy steam engine, if you want to. 

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