Yep weapons time
Going for the USA S100 0-6-0T
or in UK speak the USA dock tank
http://en.wikipedia.org/wiki/USATC_S100_ClassOne of the main reasons for my choice is that this loco type must be the most widespread class ever.
As well as the USA and UK it was used all over europe, the balkans , the middle east even China
Believe it or not there are still a couple example working for a living in Zenica steelworks in 2009
Now why did it have to have outside valve gear. :-?
Sly