Thanks.
"Operating" is relative.
They work like transfer tables.
Were there from the original "Happy Switcher" layout made by Spikerod.
My idea was to amke them CMTM active at some point.
That did not work out. But I am tinkering with the idea of cloning short portals, give them the CMTM script, giving them invisible track and placing them atop of those barges.
XD
Will see how that would look like.
Otherwise I could add another small yard on the other end of the river and set up a CMTM portal there.