The R16's were equipped with cast iron brakes, which explains the squeaking upon braking. There is a film which has footage of R16's in action and they sure had a loud squeaking when they braked.
Only the subway cars that were overhauled were equipped with speedometers (anything before the R26 was not overhauled, therefore not equipped with a speedometer)
You can activate the speedometer by pressing control + v twice.
To view FPS, press control + x