I saw 7191 in Seattle, bound for Los Angeles. Didn't have time to take down the fleet numbers while in Portland.
I don't know why the buses would be switched out in Portland... as long the engine has a partculate filter, the G4500 can run in California.
As far as BoltBus vs Greyhound here in the Pacific Northwest... the difference is time. BoltBus is a much faster trip, but it doesn't sound like that matters much to you.
The G4500's were built 2001-2003, they don't have a particulate filter. None of them have been seen in California. Google Maps recently updated their Street Views in many California cities. Complete D4505 domination. Greyhound wouldn't want to install a particular filter if they don't have to, considering the loss of fuel economy. Nobody said a DPF was required in a 2001-2003 Blue G and nobody is forced to run it in California. With all the D4505's in place in Los Angeles, it wouldn't be difficult to switch out the coaches in Portland.
Besides, like Metrolinecoach111 said, coaches rotate through Portland to reach Seattle for maintenance. Though in that case, I can't understand why #7191 would not have gone back to Denver instead. I'm also certain it's a Denver coach.
BoltBus isn't "much faster", Bolt is about 3:15 or 3:30, Greyhound is 4:05. The Blue G seating is much more comfortable than a X3-45, so I don't really care about that 50 minutes. Like I said, I would be on vacation anyway, and I would be earning Road Rewards.
BTW, Greyhound runs the "local" Denver to SLC via US 40 as an express. They list many stops but don't make most of them because US 40 is a two-lane road so the driver just sees if anyone is getting on or of (usually zero people) and passes through without stopping.
Besides, not all Greyhound drivers are created equal. For example, you complained about your driver letting baggage block the aisle, but Kit insisted that it must not block the aisle. Some drivers get you there much faster than others. And the specific bus matter too, older coaches without DPF's, like the Blue G or DL3, drive faster than the newer ones.
Also, those stops give me the chance to "visit" every little town for a few minutes.
Say, I was looking at various seat specs, and I was wondering what you guys thought about the tables at the rear of motorcoaches? I always thought they would be a bad idea, wasting room for recline. I also remember the old radio modules on Adirondack's National Seating, I bet no one uses it anymore, but they're still listed on some specs. They also have the regular options like tray tables, cup holders, manual and "automatic" footrests, seat backs that match the seat covers or carpeted seat backs, the list goes on and on. I guess winged is preferred over flat or pillow headrests. Really interested in the new National 4210SB10, wonder how it stacks up to Amaya Torino G and A-2TEN.
Amtrak California's new D4505's and their slightly older C2045's have 2 tables in the back and they've been a hit. Families and groups love them and flock to be the first on the bus hoping to grab those seats. On the technical side of things, the seats that face the tables have their reclining mechanisms removed, but the seats are spaced so that the seats in front of them can still recline.
Amtrak California also experimented with "snack trays" on the C2045s. They proved unpopular because they're small and not strong enough to support the weight of an iPad (forget using a laptop). While I haven't heard anything official, I suspect that they elected to not use tray tables because of the expense.
Really? I don't understand the popularity of the tables, but oh well, I guess people like to draw and play cards instead of viewing the scenery. Can't understand why Amtrak California's contractors are using such fuel-guzzling equipment as the D4505. BTW, they are currently selling 2007 and 2009 Van Hools. No surprise, they don't last long.