Hello,
I just purchased a ABA set of Williams Canadian Pacific F-7's with "True Sounds".
They run great. It is interesting that Williams changed production from the QSI E-unit & the "True Sound" System to the 6-amp E-unit & to the "True-Blast Sound" System in their locomotives. Williams made a great product. I am interested in the history of the various model train manufactures's. Any comments? Thanks.