The Talgo train on the SEA-PDX route is comfortable and spacious. They have a bistro car and a business class section, and power outlets at every row. The fares are very affordable too. If only they had more than 3 round-trips a day, I would imagine business travelers would be flocking to them. Right now, its roughly equivalent to driving (time wise). Hopefully at some point they will be able to upgrade the rail-line so that the trains can actually run at their intended speed!