A buddy of mine had the same thing. He started taking the light rail into downtown and purposefully parked at one of the early stops instead of taking the bus in. He said he would sit and code on his side projects for around the same amount of time. In the span of a year, he knocked out several small mobile apps and several social media plugins.
He said the benefit was being able to spend more time with his family at night when he got home. He knew he would have some time on the train, so not having to crack his laptop to get in some coding after dinner allowed him to spend a lot more time handling the kids and spending time with his wife.
"Work/Life balance achieved!" he used to proclaim with a big smile when we'd sit and chat.
My commute to work is quite long but there is no "sitting" in Tokyo's trains in mornings/evenings so I program on a smartphone. Yes, it's not impossible but it takes time to get used to it.