Advice on where I could get an oul banger of a bike

I will soon have to get the train to town to work however the train station is about a 1.5 mile distance from my house. I will cycle to work in town the odd day on my racer but for a couple of days a week I will just cycle to the train staion and lock a bike their. The journey from my house to town is about a 50 mile round trip so I won't do it every day, I was just looking for advice as to where you would recommend I could get an oul bager of a bike to get to the train station on. Obviously I do not want to use my racer as its likely to be nicked.