Not the class of answer you probably expected, but it seems to meet your criteria, more or less*.
In Shanghai, China, you can catch a "train" from Pudong International Airport.
It's the only one of its sort in China and not too common worldwide.
Was and may still be the fastest commercial train service in the world.
Peak speed is 430 kph, making it the fastest I've ever travelled on land.
It's a Maglev train - no wheels, no ground contact, feels like flying, looks like flying (IS flying). German 'Transrapid' design. They hoped to sell them to China for use elsewhere but this was the first and the last - China instead adopted the convention "D Train" which runs at closer to 200 kph.)
Above photo is cropped from image on above Wikipedia page.
Over some of the route the Maglev runs alongside a motorway with a max speed limit for cars of 100 kph. At around 400 kph the train passes cars as if they are standing still.
There are two trains on the track. They pass halfway along the route on a double parallel section. At an effective approach speed of around 800 kph the passing is impressive.
Bang, blurred impression of motion outside windows, chucketa chucketa chucketa , ... gone. A few seconds. 100 metres of train. 0.5 seconds. Awesome.
5 minute video here (not mine) - passing happens at about 3m-06s. Takes around 1 second for 2 x 100m trains. [800 kph ~= 220 m/s so for your window to traverse whole 100m of other trains takes about 0.5 seconds. From first crossing to ends passing takes about 1 second.
Fare is not cheap compared to bus or train to town, but is reasonable given the uniqueness and experience. Without looking it up, maybe $US10. It's fast BUT stops on the edge of the city - near an Expo centre that it served when first opened. You can catch bus or taxi from there to city centre but it adds inconvenience. There is also a nearby subway which is quite a good way to get to and from it.
- Maglev, only in Shanghai in China, possibly fastest commercially operating in world.