Steam Powered Tanks

I came across this thread at the World of Tanks forum (via the Space 1889 Yahoo Group), which has some very interesting pic of developmental tanks which I hadn't come across before and the attempted application of steam for power.  Focused on US developments, its well worth checking out and has some great modelling inspiration.
http://forum.worldoftanks.com/index.php?/topic/236601-steam-powered-tanks/