Okay, I guess that makes sense that if it only has two stops, then the Seattle Center Monorail just a people mover and I suppose I can live with it being tier 5. Anyway, I will hopefully start working on creating the systems for Seattle and Vancouver within the next month or so.
Also, I forgot to mention that Tacoma has its own streetcar line, known as the T Line. Wikipedia calls it light rail but it uses the same streetcar vehicles that are used on both the Seattle and Portland Streetcar, and OSM tags the line as a streetcar, so this would be tier 5.