independent brake response times

Model Railroader Prototype information for the modeler
41

A good layman’s explanation is here:

https://ebs.co.uk/history-of-air-braking.aspx

(scroll down). This was standardized in American practice in the early 1930s and, as noted, the current ABDX (and the convertible ECP version) are just improvements on it.

42

If you take a look at NKP 765, what’s that I see in there but a 26 brake valve.

https://tinyurl.com/y4fzvr9g

It didn’t come from the factory that way!