Gosh, I'm lazy. I took this video last week and I am just now posting it. But if you scurry down to the Midway Shopping Center (Simpson to Hamline) you can see some track welding for yourself. This is the area where they'll be laying out and putting together all the long pieces of new LRT track, which will then be moved down the avenue and into place - about a thousand feet at a time! Notice the railroad ties spaced out on the ground to hold the track.
If you listen carefully you can hear another bus rider exclaim something about it being for the train (I remember this being totally hilarious in person, but it is pretty muffled) - then later asking when they will be done. The bus driver says (unenthusiastically) 2014. Ok, sort of true, but most of the construction in the Midway will be done by Thanksgiving. I shake my head a lot on the bus.