Gold Track has been around for a while and yet it seems to be an unusual alliance privilege in that it is so inconsistently offered. I assume it's the airlines that have to pay for it at a given airport, or maybe it's Star Alliance ? Maybe it's the airlines not wanting to pay for it at a given airport, or the airports charging too much ?
I am not aware of any list of all the airports a single airline's pax can use Fast Track at if *G (since at some airports it's a signed Gold Track and other times it's just certain airlines giving airport premium lane access to *G). For TG, I've only noticed it outbound at MEL. They hand out an express pass at TG checkin for *G flying Y. But I don't look that hard for Gold Track at most airports. It's a pity Gold Track airports are not in the Star Alliance app (lounges are).