Update 2020:
I hired on shortly after creating this post. Tues-Sat Package Car driver out of NYMNS. Best days of my life. Drove for 3 years before leaving for the railroad, which was my goal since middle school. Currently a Locomotive Engineer at Amtrak, this is the place I wanted to be.
Our crafts are similar in many ways except I don't have a guarantee. You could work 3 hours one week and the next you max out your HOS and "die on the law" (stop train, secure consist, wait hours for crew van to arrive with relief engineer and assistant engineer). My advice to anyone looking to leave UPS for a railroad job is STOP. DISMOUNT. Or you can get used to doing exactly that, on-and-off railcars in a customer's yard at 3am every Sunday for 6 months a year. You will miss UPS. I did until I got extremely lucky and got the federal job (well, quasi-federal).
Amtrak is the golden employer out on the rails. Again I got extremely lucky. Working for the freights is not for the faint of, well, wallet. Amtrak is subsidized and doesn't lay-off. Major freight RRs have shareholders to answer to and are very creative at reducing operating costs (you). I worked for two Class 1 freight railroads, at the same time actually. Ask me anything you like about that.
I don't know why but I still log on here daily.