the two with magnetic retractable couplers both needed to be looked at. on one, i couldnt get the nose to come out so took them both apart and made a few adjustments. then, i couldnt get the coupler bar on either to stay out so had to have another look. finally got it sorted after a bit of fiddling around.
it is quite a neat idea and they would look awesome running around a big layout or on an elevated track.
there will be a new page shortly. as i have worked out the two little trains are from the choro-q range. that page can be found here.