If you own one railroad and an opponent owns the other three, do not trade them the fourth. Instead, trade your railroad to a third player for cash, creating a stalemate. Denying a monopoly is more important than making a small profit.
Educational filters rarely block Google’s own domains ( sites.google.com ). Search for: site:sites.google.com "Richup unblocked" . Many teachers and students embed the game into a Google Site disguised as a "business simulation project." richup unblocked