I read recently that redstone circuits have a North-South quirk, where circuit delays are different depending on whether a redstone torch faces North/South or East/West.
Do minecarts have any directional related quirks?
Minecarts will favour travelling south or west (known as the South-West rule) when they reach an intersection. Also, placed tracks will favour curving south or west. Additionally, when two minecarts are adjacent to each other, they will speed up extremely quickly,. This is commonly called a booster. The South-West rule is used when making self-resetting boosters: