AHHH We are converging
In the 1887 Burlington tests WAB and Eames added electricity to their systems and reduced their times from head end to rear end of 50 cars commensurate to that achieved by Carpenter's electri-air brake in 1886
Without electricity WAB had made a minor time reduction- with a big shock increase. So GW came out to Burlington and tinkered during the summer. A revised triple, which had the QA features, and increase of brake pipe diam from 1 to 1,25 reduced the front to rear time to just over 2 sec and no shock.