Working Life is a monthly column in which Texans talk about their jobs. McDonough, who is 55, is an engine driver and conductor on the Hermann Park Railroad, in Houston.I worked in the Houston Independent School District for 31 years. I was a principal for 19 years. After I retired, my wife was scrolling through Instagram one day and noticed that the Hermann Park Conservancy was looking for train engineers. I reached out to them, came in for an interview, and got the job. Our lead engineer works full-time, and everyone else is part-time. There are a few guys in their twenties, and then there are about seven of us who are retired. My dad also drives the train. Sometimes we work shifts together.Steve McDonough, Michael’s…