As far as powered units go, a B unit is no different than an A unit. It seems model railroaders have just mentally made them different and feel the price should be lower since they aren't as pretty. I have a TMCC super bass B unit which sounds fantastic. I'm sure with Legacy RS they're even better. I run prototypical consists so if the real thing had a B unit so will I. As for powered/ unpowered, generally 2 powered units are enough for my layout.
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