Thanks all. Here's another one. Not so much ambiance.
Ambience be damned: this is classic "street." (By the way, if I recall correctly you have posted it before, either here on on That Other Site.)
This picture also is an example of what I have always found to be so challenging about the genre: the momentary expressions and postures of all three subjects are what make it work.
To succeed with this kind of photograph, you typically only get one chance to make a great shot and if your timing isn't perfect, you wind up with an also-ran. I can't begin to count how many of my efforts at street photography have failed because I was a second or two slow in hitting the shutter release.
These days, you can stack the odds in your favor with a digital camera by using the sports and photojournalism shooters’ "spray and pray" technique. But back in the film era, you needed a hair trigger—and preferably to be well-caffeinated.