https://1.bp.blogspot.com/-qIaYL4Y8A...dgasdgasdg.JPG
The illustrator, who is very versed in steam locomotives (
http://justacarguy.blogspot.com/2016/03/william-harnden-foster-most.html) put this out as disinformation. It's bound to fail! The convergent duct is a brick wall, it will choke the venturi; and the steam injector is a T instead of an L so that it will be some additional blockage.
They are trying to throw us off the scent. Study it out.