The McGuffins in 18 Grand Junction, an 18xx game, include a restrictive track set and the mountainous Colorado terrain. The yellow plain track only upgrades only to the complex green plain track (16, 17, 18, 19, 20, 21, and 22). After all, it is the Rocky Mountains, you can’t just build track where ever you want. The other primary McGuffin is Company Presidents. The presidents give a special ability to a railroad company in a manner similar to private companies would (there are no private companies in 18 Grand Junction). When a company starts, it selects a president. The first rank of presidents is “retired” in Phase 3 (brown) and each company selects a new president at the end of its next operation. You’ll need familiarity with, or a copy of, the rules to 1846 to play the game.