Talk:VR Class Tk3
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Third piston?[edit]
![](http://upload.wikimedia.org/wikipedia/commons/thumb/d/dd/Parola_Tank_Museum_184_-_Armoured_Train_%2837682186375%29.jpg/220px-Parola_Tank_Museum_184_-_Armoured_Train_%2837682186375%29.jpg)
What's with the extra piston in the valve chest? Is this some sort of expansion valve? I thought it was a Vauclain compound when I first saw it. Andy Dingley (talk) 20:46, 13 November 2018 (UTC)