Been looking at a R/T Seattle- Vancouver. Cascades train # 510 out # 517 back. Frist train out from SEA last train back from VAC. Amsnag shows all business class sold out the whole month of April. Did not check any other months. Is that set of trains that busy because of business travelers ? I checked week days because thats when I would be in SEA. I read in other post that lines for Cascade trains in SEA can be very long for coach pax.