What is the "Gravy Train" in Monopoly Go?

The "Gravy Train" in Monopoly is a term not officially recognized by the game's rules or traditional gameplay. It typically refers metaphorically to a player who has gained significant momentum, usually from owning a string of properties with houses or hotels that earn them substantial rents every time another player lands on them. This generates a steady flow of income, allowing the player to further invest and dominate the game, much like a train continuously circling the board collecting income. The concept resonates well with Monopoly's underlying theme of wealth accumulation and economic strategy, as players aim to amass wealth while bankrupting their opponents.