Recently I've been doing my very own personal renumbering program for my fictional railroad. It has the months, days, and years that engines are renumbered(patched or repainted entirely) into my very own railroad's livery. It also covers the retirement &storing of locomotives as well as being sold to other rail-lines. I will do my best to get all of my transactions in before I leave for basic training. I saw a page a while back of a person who worked for the UP and did an exact inventory just like this and I decided to follow suit. It'll be on the next page however.