I love to commute by bike, but what you are doing seems like a lot of hassle for the short amounts of time you are biking. If it were my commute, I'd walk to & from the light rail station, especially if a .7 mile bike commute is 'eating your pants'. Just not worth the hassle. If I rally wanted to ride, I might ride to the light rail & park my bike there (not a nice bike, but something that won't kill you if it gets stolen, since it's only .7 miles), then walk in from the light rail to the office.