A bit of description of your route profile.

10 miles of suburban roads, about 4 miles of those roads bisect forest preserves (nice). I end up at a train station, at which I board for about a 30 minute train ride. After getting off the train, I get on a second bike that I have in a bike locker at the station. Another 5 mile ride on more urban roads with heavier traffic gets me to my office. I repeat the ride in reverse on the way home.

What kind of bike you ride. (photos would be cool)

Being in the Chicago area where it is exceedingly flat, l normally ride single speeds. I have a single speed Bianchi San Jose and a single speed Specialized Langster that is fixed. In the winter (which is now) I put studs on the San Jose and also start riding an old school, reasonably high quality, rigid GT mountain bike with studs. Other times, I might ride my Yuba cargo bike or my Citizen folder.

How you carry your gear and what or how much (volume) stuff you bring on the ride.

Arkel Bug or Ortlieb panniers. Sometimes (but rarely recently) a backpack from Banjo Brothers.

Distance & time (average speed if you care to share)

Timing in the winter is a poor reflection of the rest of the year. It can take me an hour or more to get to the train station when it it <0F with -25F windchill. In the summer I can do it in about 35 minutes when I am flying.

How long you've been doing this and any thoughts you have toward the future of your commuting.

5 years on my current commute, 3 years before that with a 36mi RT commute (no train in the middle).
I sold my car earlier this year, so I anticipate doing this for a while.