Technically, it runs on "HypePressure". (Yes, I know I'm digging myself deeper in to this hole) P.S. Do you know how the HypeValvegear works? I assume that it's a HypeWalschaerts type.
Now a link to it is on the 2nd post: http://forum.kerbalspaceprogram.com/threads/114646-Unofficial-Official-1-0-Hype-Thread!?p=1818314&viewfull=1#post1818314
HYPE!! can I drive? EDIT: Please take a look at GregoxMun's very nice post about the hype train: http://forum.kerbalspaceprogram.com/threads/114646-Unofficial-Official-1-0-Hype-Thread!?p=1818418&viewfull=1#post1818418