I still feel Via should have gotten CN's expressed acknowledgement that the equipment they are building, in the set up they want would work on their lines. That should be a key document in this case.
Some key dates and communication:
October 15, 2021 - CN's Manager of Signals emails VIA: “CN will authorize the use of the new 24-axle train sets on its routes. A ten-day notification to CN is required before placing these train sets in revenue service on any CN route. CN reserves the right to place any restriction it deems necessary should shunting problems occur.”
December 3, 2021 - CN issues Operating Bulletin 638 allowing VIA Venture equipment to operate LRC NB speeds on the Kingston Subdivision.
July 25, 2022 - VIA emails CN: "We are planning on operating to Oshawa on July 27 and to Toronto on August 4 and August 9. Could you please ensure that the bulletin enclosed includes the whole Kingston Sub, we are missing the Great Lakes portion? To our knowledge, “we have no outstanding open topic with regards to the authorization of the new Fleet with CN. Can we get LRC NB authorization for all Corridor? If not, which info is missing?” [Here's Set 1 returning from SW Ontario through Kingston on August 6.]
July 27, 2022 - VIA emails CN: “Since it is our understanding that the CN technical review is completed, and to avoid this situation in the future, could we get a written confirmation by CN that the Host Railway Package submitted by VIA to CN has been reviewed and deem complete, and that CN has no further questions". CN responds that “Engineering will be the ones to sign off. The bulletin confirms your movement also."
October 24, 2022 - VIA emails CN: “VIA Rail is planning to start passenger service with the Venture Fleet on November 8th, 2022. Daily Consists issued by VIA’s Operations Control Centre were accessible by CN showing which VIA equipment was operating on each train. VIA claims this transparency was provided to CN in real-time. On the same day, CN's Manager of Signals - Engineering sent an email to VIA's Project Director for the Rolling Stock Acquisition, part of the Corridor Fleet Renewal Program (New Fleet), asking which Venture configuration VIA would be putting into service. The response was, "Same configuration we have been testing, Long Trainset: Loco + 4 coaches + cab car. We will not change it until we test shorter consist and agree with CN on the path forward."