There is actually a little trick to tell what equipment is scheduled to run on any particular train on any particular day. This is all programmed in the reservations system to facilitate seat assignment, etc. Ticket agents can access the full information, but you can also see it from the main booking site.
Here's how it works. Go on VIA's website. Enter in your destinations/date/etc., and click through to book. You'll get a screen showing your train and class options. Go to the train you want and select a class of service (any class will work).
Once you've done this, you'll see a few icons to the right hand side of the screen - sometimes a bag (if checked baggage is available), a seat, a WiFi logo, and a symbol "i" in a circle. Click on the "i", and a pop-up window will open.
Look at the address bar for this pop-up window. It should have a url something like this:
"
https://reservia.viarail.ca/tools/viewc ... c0=VIA&s=0"
The important information is towards the end of the url. Specifically this part: "0=50&e0=LRC&cc0=VIA" - In this section, "50" is the train number "LRC" is the equipment type, and "VIA" is the carrier (the reason "VIA" must be specified is because VIA will allow some GO train bookings, which show up as "GO" and "TRN" as the equipment type).
There are 5 possible codes for equipment:
LRC = LRC equipment
HP2 = HEP2 equipment*
HP1 = HEP1 equipment (i.e. the Canadian, Churchill train, etc)
MIX = HEP2 equipment with an LRC Business Class car
REN = Renaissance equipment
*Note that "HP2" trains may include one or two HEP1 coaches in addition to the HEP2s, but they will be primarily HEP2. This mainly applies to trains 63/64 and their connecting counterparts 75/70, which have recently typically had some HEP1 coaches mixed in with the HEP2s.
This trick applies across the board, unless last-minute equipment changes are made.
The majority of the Corridor fleet is indeed LRC, but HEP2s run on a number of trains. The only Renaissance sets currently in use in the Corridor are between Montreal and Quebec City, though there are reportedly plans to start running them again between Montreal and Toronto via Ottawa some time in the near future.