Thanks for the links, Icon.
Beware! I’m using Google Translate! All bets are off!
This is just from the first link.
When I looked at the video, it looked to me as if he just backed up too far, but it looks like one of the passengers said, rather, that the bus stalled:
And the news report says that a repairman had something to say about it:
I think it’s saying that stalls are usually caused by inadequate power, misuse of the clutch, or shifting into the wrong gear. (I knew that.) I think it’s also saying that with only half the air pressure left (have I got that right?), the brakes may not work. (I doubt if I ever knew that, but if I did, I forgot it.)
So now I finally get that I’m making the mistake of thinking like a car driver, and an old-fashioned one at that. I guess it’s also possible that there was no emergency brake? With a big vehicle like that, maybe an emergency brake isn’t feasible?
Edit:
Some of what I’m reading on the 'net indicates that buses have emergency brakes, but that apparently they are air-powered, so engine failure may cause them to stop working.
I wonder what kind of steering the bus had? I read that if the engine stops it’s very difficult to steer a vehicle with hydraulic steering. (I think I already knew that.) But the same article said that with electric steering, you can keep steering after the engine stops. (I didn’t know that.) absoluteastronomy.com/topics/Steering
No, they shouldn’t, but if they do, well, they do.