Yes! This and the comment below points out the space bar is also a very loud key we can single out on all keyboards. I set my trackpad to use tap to click because I prefer it and it avoids that sound but I do occasionally click by pressing it. Now you've got me thinking how disturbing I might be with my occasional clicking on my MacBook Air on the quiet car.

I have a model-m. Do I win a prize?

Only if you use it connected to your laptop while sitting in a train.