We have them in Austin. All of the regular city buses take two bikes. They get used a lot; seeing a bus without a bike on the front is increasingly rare.

A few of the express commuter buses are the big coach/touring types and don't have racks, so the driver gets out and opens the cargo bay below and you stick your bike in there. It's OK if you're not too worried about wear and tear from the bike sliding around a bit.

We just got commuter train with bike hooks last March and I hear that they have lots of bicycle traffic from cyclists taking the train out to the suburbs for rides in the countryside. I'm on vacation next week and might have to do that myself!