Microsoft Train Simulator Easter Egg - Assorted Little Eggs

There are a handfull of small eggs found in Microsoft Train simulator, the easiest to find being:

1.) Hidden routes. On several routes, Marias pass for example, you'll find curious little bits of track that are hidden away. There's no way to start a train on them short of using the activity editor.
In marias pass, just look for the odd circle.

2.) UFO: In the objects file, if you pick through the various things listed, you'll find a UFO hidden there. This never really shows up in the game, but it's there just the same.

3.) Names on the rock: There's a rock in the Marias Pass route that has a ton of names spraypainted upon it. These are actually names of the designers and beta testers. There's also a few little messages from them.