Sorry, that was a pretty useless post, I wasn’t sure I was in the right place
One train has a width of 3 1/4” between the wheels, the other has 4 1/4” between the wheels. Both are about 1.5 - 2m in length with a load of accompanying track.
A nice man from the local club told me that the green one is called the ‘Green Arrow’ and the other the ‘Britannia’ - not sure if that helps :-)
I’m not sure what other measurements would be useful but please let me know and i’ll get them.
Both are live steam engines, the green one is finished and I have memories of it running up and down his garden, whereas the other is obviously unfinished. I also have memories of the plans for the unfinished model being in the garage, but that might not still be the case after all these years.
Some photos (hopefully they work)...