You can get Get 60% Off Via Rail From April 22nd Until July 3rd. However you MUST book your travel before the 25th April to claim this promotion, but you can book for future dates so as long as you know when and where you want to go this promo might be right up your street.
Here are a couple of examples of the deals you can get;
Toronto to Montreal: Regular Price $135 | Now $54
Toronto to Vancouver: Regular Price $788 | Now $315
The latest Via Rail Canada offers are found here