Dark Grey Mini Girder - J-15

Those are actually the light grey ones that come with the Thomas & Terrence Log loading set.

You are precisely correct and I didn't realise there were two shades of grey riser. I was looking for the dark one not the light grey one.
 

Dark grey usually comes with steam thomas set. Only 4 in per set. There is thomas and Elizabeth japanese set. It comes with 13 i think. Ill have check as i have it.

Wow - I think you nailed it. I am guessing they were included on some other Thomas sets sold here in Australia  because I picked mine up in a used box of track and I only have 4.

I really like the look of them combined with the light grey elevated track. And just when I was scratching my head wondering where to find some the universe responded to me (with eBay of course):