chris collister Dec 6, 2012:

A bit late, apologies but apparently it means "double flange". The flange on a train wheel is known as the "joue". This does make a bit more sense, but I have no idea what a "double jaw" brake is!

chris collister Dec 3, 2012:

jeu, apart from the obvious meaning, is also a "set", or in a slightly different context, "play" as in play in a bearing or shaft (or "backlash"). It makes as much (or as little) sense as "joue".

Sone-Ngole Alvin Ngole Dec 3, 2012:

Not too sure of "double jeu" I am not quite sure it is a typo considering the position of the 'e' in "joue". I don't equally think "Double Jeu" makes much sense.

Steve Sutcliffe (asker) Dec 3, 2012:

Hi Chris - yes I think it could well be a typo or spelling error. This document is full of 'em! Thanks for your thoughts.

chris collister Dec 3, 2012:

I wonder if the author meant "double jeu", which could be interpreted as a twin brake (for redundancy). I have never encountered a brake with cheeks: they usually have drums or discs (though some train brakes are electrical or hydraulic).