For some reason your photo isn't showing, so let me jump in with
American Flyer Transformer
Not sure if I follow how this game is going.
So if someone sports a pic of a Tank ... then it has to relate to another type of tank? like tank car? or army tank ? Or weathered water tank?
Thanks for participating and for asking.
As long as you match some element from the most recent photo posted, you have made a link in the chain. The most recent photo that I am looking at is FRENCHTRAINS'
You could match any of the tinplate cars, track, a train, a spotlight, barrels, toolbox prewar, standard gauge, etc. Sometimes it can be difficult to find a match, but you can be flexible and creative, and hopefully have fun.
I will make a link by posting a photo of mine that has a caboose in it.
Next person who posts can match any (or several) of the elements in my photo.
I hope that helps.