What's this?

What purpose is this for in the way of M.O.W.?
I saw it rolling through this morning on the BNSF line.

18-24 STONE SWITCH GRINDER

Grinds switches, road crossings, crossovers and other short stretches of track that the big boys (Pandrol/Jackson/Speno & Loram…80-96 stone units) cannot get without major efforts.

You are looking at a Fairmont version of a switch grinder.

I have yet to ever see one. Everytime I hear one is in the area…something comes up!

Thanks Mudchicken!