The pre-1914 ones were side-wheelers, I think there was a British Company
involved. The Royal Engineers ones were a mixture. There was a class, called
the S-class built. they were quarterwheelers, like stern-wheelers with one
wheel on each quarter rather than right across the stern. There were some
side-wheelers, and some of the former LCC London River side-wheelers were
purchased.There is practically no literature on the subject, only occasional
mentions in other works. I have been researching these off and on for years
Alistair