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These "Turbo replacements" were notable because they were the only VIA trains operating on the Kingston Sub with one unit, usually a FP9A, but sometimes FPA4. Also of note were the consists' length - as few as four cars, as many as seven. Each comprised a Club car, a Cafe-Bar-Lounge, and two to five coaches. Often, the coaches were 5200's or 5300's!
In 1979, as CN passenger equipment was receiving the VIA scheme, these trains were often a mix of CN and VIA paint. I've come across a plethora of interesting consists in preparing this book. VIAphiles will find them of great interest. Highball!