Do you park outside the CTA station? If you have a nice bike that you want to keep, that seems like a recipe for potential trouble, no matter how well lit or busy the front of the station is. If there is bike parking inside the station (which many stations have), that seems a bit safer, but still not ideal. Lot of people coming and going, no one paying any attention to anyone else. I know that the California Blue Line station that I use occasionally has had bikes stolen from out front, in broad daylight, a block away from the police precinct, and with a decent amount of foot traffic. A kind of hip new single speed like the 925 would be a pretty tempting target, and I imagine pretty easy to resell.

I'd suggest you take advantage of the wonderful fall weather we're having, and ride all the way to work. This is the best time to ride - you don't have to worry about being totally sweaty all the time, and don't have to wear twelve layers of wool and two pairs of gloves just to make it down the street. Enjoy it!

And make sure to lock both of your wheels.