Thank you Tony, for all that information! The two steam ships look in good working order, and were set to be making weekly cruises from the end of this month.
It looks perhaps as if time has not been kind to the original Vysehrad and that is perhaps the stripped down hulk with bar and street market on itt whose bare paddle wheel is my 3rd photo. I may be wrong of course.
The Sumava is a particularly interesting vessel, along with I beleive two sisters in Prague, one a static restaurant and the other seeming to operate not with paddles in its paddle boxes but large propellers that were positioned only half in the water. Again I may be wrong as it was difficult to see what was inside the enclosed paddle boxes.
I found on the web a picture of a model of Sumava at the Prague model boat club. It would be very interesting if someone could find some pictures of these stern wheel paddle tugs in their original 1953 form. They still retain some splendid engineroom casings and hatches forward of their modern deck houses. The hulls by the way are of a riveted construction.