First a bit about double tall busses. Then a bit about my trip out to Lynnwood to finally, after years of wanting to ride a double tall, doing so!
Double tall buses, also known as double-decker buses, have become an iconic part of Seattle’s public transportation landscape. These impressive vehicles offer increased passenger capacity while maintaining a smaller footprint on the road, making them an efficient solution for high-capacity routes.
The Alexander Dennis Connection
The majority of double-decker buses in the Seattle area are manufactured by Alexander Dennis Limited (ADL), a British bus manufacturer with a strong presence in North America. The company’s Enviro500 model has become the standard for double-decker operations in the region.
Sound Transit’s Fleet
Sound Transit operates a fleet of Alexander Dennis Enviro500 buses, specifically the MMC (Multi-Modal Coach) variant. These buses feature:
- Length: 45 feet
- Height: 14 feet
- Capacity: 81 passengers (57 seated, 24 standing)
- Engine: Cummins ISL9
- Transmission: Allison B500R
- Air conditioning and heating systems
- Low-floor design for improved accessibility
- USB charging ports and WiFi
The Enviro500 MMC is known for its modern design, fuel efficiency, and passenger comfort. Sound Transit primarily uses these buses on their ST Express routes, particularly on high-demand corridors like the 510/511/512 routes between Seattle and Everett.
Other Operators
While Sound Transit is the primary operator of double-decker buses in the region, other transit agencies have also incorporated them into their fleets:
- Community Transit: Operates Enviro500 buses on their Swift Bus Rapid Transit lines
- King County Metro: Has tested double-decker buses on certain routes
Technical Specifications
The Alexander Dennis Enviro500 MMC features several advanced technologies:
- LED lighting throughout
- Electronic destination signs
- GPS tracking and real-time passenger information
- Advanced driver assistance systems
- Euro 6 compliant engines
- Composite body construction for reduced weight
Impact on Seattle Transit
The introduction of double-decker buses has significantly improved capacity on key routes, particularly during peak hours. Their ability to carry more passengers while taking up the same road space as a standard bus has made them an efficient solution for Seattle’s growing transit needs.
Taking a Ride to Lynnwood
Today I took a ride, for the very first time, on one of Sound Transit’s double decker buses. I opted, since it would include some light rail usage, to take the 515 Express from downtown Seattle to Lynnwood. This is the story, of all the things I noticed along the way.
I believe it was the 4:15pm bus that I boarded between King Street Station and Union Station. I’d racked my bike, then stepped onto the bus, swiped my Orca card, took a video (see below) and climbed the steps upstairs.
The bus then carefully, and very smoothly, traveled forth through the streets of Seattle. Slowly coming to and striking branches of trees because of the height. We stopped at about a dozen stops, from the originating stop I boarded at through to the egress point from downtown. When we left, we did it in relative style because we exited via the express lanes.





To note – when I showed the “empty” bus just after the first stop downtown, it was almost entirely full by the time we left downtown. Don’t get in your head that this is an empty route, it’s a very well used rush hour service. A kind of extra interlined service, in addition to the light rail and other Sound Transit Express lines that go out this way.
However, if you watch the video all the way through, you’ll notice the enjoyment of zooming along in the express lanes comes to an end before we even got past the Greenlake and Ravenna areas! Motorized “road” transportation without right of way is, and always will be a joke when it comes to speed and throughput.
But, that didn’t really matter much because being on a double decker, in a cool air conditioned environment with big ole’ windows to see as far as thee eye could see was a joy! We carried on, as you do, at a reasonable 20-35mph. The traffic slugged into a accodian like zig zag of slow drivers stuck behind entire cavalcades of other slow drivers under the guise of the inefficiencies and stupidities of mass transportation movement via single occupancy vehicles.
In other words, we were limited by the stupidity of cars as primary modal option at rush hour.
But it was entertaining and pleasant. I wrote up this blog entry and got some work done as I explored this new transportation choice for traveling north to Lynnwood.
At this point I also had zero idea what I would do once I got to Lynnwood, but I didn’t really care, I’d likely the board the Link Light Rail line back south and then take the 542 at University District back home.
The Bus Itself
The bus itself, being a double decker, is very smooth similar to one of those intercity buses. The air conditioner worked great, so it was a cool ride in spite of it being a bit warm outside.
Additional Observations
As we rolled forward and stopped, then moved forward again, and stopped, and then lurched and stopped, we made our way ever so slowly to Lynnwood. I couldn’t help but wonder, was this even faster than light rail with all this traffic? I had no idea, as I’d never even looked at the schedule vs. what time this was taking now.
At one point we just stopped for a solid 20+ seconds and sat. Traffic unmoving and a light rail train zipped by beside us, one going north full of people and one going south with a dramatically smaller number of people.
It really did seem like the light rail would have been the faster choice at this point. However this is likely the smoother option, considering how the double deckers ride! They really are not like other buses.
Drama!
In normal society fashion, at some point some guy got a phone call and began talking loudly – very “American” of him – about a financial situation that a child or someone in family was having difficulty with. He wanted to see funds and bank accounts and started “telling them” a number of things.
Why are people like this, what is the deal with the lack of situational awareness? So many parents bring up kids to become these adults that just utterly drives me nuts as a parent. I’ll take rowdy kids any day over an oblivious adult yapping drama out of the pie hole openly and loudly!
But even with that slight little interruption along the route, the ride was great. One more great way to commute in the Seattle area, so great I’d even put this up close right after “Ferries”, “Commuter Trains”, competitive with “Light Rail”, but definitely better than intercity buses!


















