Info Please - Stackable Support Girders

I'd appreciate any information about the track supports shown in this video from 2012:




Some of the supports have just appeared on Ebay, courtesy of our friends in Ambers Alcove.

[Super]

Isn't that a great video. Those are Trackmaster and they are very hard to find...buy them.

they only came in one set, if i remember rightly, called the cross, switch and stack track pack. each set came with 6 girders. [12 legs and 6 top plates]

they only came in one set, if i remember rightly, called the cross, switch and stack track pack. each set came with 6 girders. [12 legs and 6 top plates]

Thanks, that's all I needed, googled and....

I may have some for trade.