I've done two railroad retirement cakes in the past couple of weeks. The same guy ordered both cakes and he didn't really care what was on them.
One guy is retiring and moving to Michigan. I chose to put both states on the cake with rr tracks running across NE and a car taking him to Michigan.
The other cake they had a saying to go with the cake. I just added rr tracks around the wording. I also put red stripes on the side of the cake to match the Union Pacific logo.