From this site [
www.trainweb.com]
"The International had a very interesting mix of equipment over the years. Apparently, Amtrak and VIA once alternated providing equipment for each day, and the cars VIA used were ex-Amtrak 3500-series LRC cars. The train ran with VIA F40 engines until VIA's engineers became certified to operate Amtrak's Genesis engines in 2000 or so (of which VIA would soon purchase their own). For most of the 1990s, Amtrak equipped the train with Superliners, occasionally inserting a refurbished ex-Santa Fe Heritage hi-level coach. However, as Amtrak's backlog of deferred Superliner maintenance reached critical levels in 2002, the train often operated with high-density, 84-seat Horizon coaches."
It looks as if VIA F40s handled Amtrak cars from a pretty wide pool.