How do you take control or buy out other competiters or companys in Sid meiers railroads PC game

In the game, each player's company is divided into ten 10% chunks of stock. Throughout the game, the player may purchase any other player's stock, as long as some is available, including his own. The price of each stock depends primarily on the net worth of the railroad (higher net worth fetches a higher stock price). However, as shares become more scarce as they are purchased, the remaining shares go up in value. Also, there are occasional "stock market crashes" and "stock market booms" as proclaimed by intermittent newspaper announcements, each of which precedes a period where all of the stocks either lose value precipitously or gain quickly. A wily investor with enough cash on hand and good timing can make plenty of money or competitive stock trading maneuvers in such instances.

Once all of a company's shares have been purchased, the opportunity to purchase the entire railroad emerges. At this point, any player can purchase the railroad whose shares have all been purchased. However, each player must pay double the market value for any shares he does not own. For example, if Player A had purchased 70% of Player B's stock, he would purchase the remaining 30% of the stock all at once for double the price; however, even if Player C has 0% of Player B's stock, he can still purchase the entire 100% at double price. Player B may also buy back the other 70% of his stock (assuming he owns the other 30%) at double price, however this is not typically a good move - the cash goes to the player the shares are purchased from.

When a player achieves 100% ownership in another railroad's stock, he is immediately given the choice of merging the railroad into his existing operation or liquidating it. Merging basically means that the purchased railroad converts to the player's railroad, keeping all its infrastructure, trains, and routes. If the player chooses to liquidate the railroad, he is paid a portion of the railroad's value in cash and the purchased railroad disappears from the game map.

The game ends, in a sense, when all the competing railroads have been purchased, or when the player's railroad is purchased by a competitor. Should you be crafty enough to purchase all the competing railroads, you will still be allowed to play until you either reach the end of the map's allotted gametime or until you choose to retire.