My girlfriend gave me a LEGO train engine (4837) as a gift. I started looking around more at LEGO, and liked the direction Power Miners and the new Construction sets were headed.
Honestly, I think Power Miners and the new Construction sets can work pretty well together. I've got a few other ideas for more "mature" Power Miners, so hopefully you'll see more of that sometime soon.
Yes, the tracks are from the bulldozer. Those are the only tracks I have currently... other than the rubber ones that come with the PM sets. The dozer is one of the other recent purchases I've had. I love the scale of that set (seems more "real" and "appropriate" given the size of actual dozers).
That idea deserves to get built.