2023/12/01 update

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Worm Gear Rear Axle 1928/1929 Overview

Without emergency brakes – AA-4000-A = 7.25:1 gears, AA-4000-B = 5.17:1 gears

With emergency brakes – AA-4000-E = 7.25:1 gears, AA-4000-F = 5.17:1 gears

Future AA-Chassis page.