Subway Scramble

Welcome to the action puzzle simulation that takes you on a rapid transit romp through the epic subway systems of New York, London, Paris, Moscow, and Seoul. It's a worldwide wreck of snarled subways, mangled metros, and lost passengers. It's up to you to make sure that all the passengers return to their proper destinations! It won't be easy... multiple train cars, overlapping railway, lines and a wide array of color-coded destinations make Subway Scramble a unique and mesmerizing challenge.

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Some urban rail lines are built to the full size of main-line railways; others use smaller tunnels, restricting the size and sometimes the shape of the trains (in the London Underground the informal term tube train is commonly used). Some lines use light rail rolling stock, perhaps surface cars simply routed into a tunnel for all or part of their route. In many cities, such as London and Boston's MBTA, lines using different types of vehicles are organised into a single unified system (though often not connected by track).

Although the initial lines of what became the London Underground used steam engines, most metro trains, both now and historically, are electric multiple units, with steel wheels running on two steel rails. Power is commonly supplied by means of a single live third rail (as in New York) at 600 to 750 volts, but some systems use two live rails (notably London) and thus eliminate the return current from the running rails. Overhead wires, allowing higher voltages, are more likely to be used on metro systems without much length in tunnel, as in Amsterdam; but they also occur on some that are underground, as in Madrid. Boston's Green Line trains derive power from an overhead wire, both while traveling in a tunnel in the central city and at street level in the suburban areas.

Older systems generally use DC power rather than AC, even though this requires large rectifiers for the power supply. DC motors were formerly more efficient for railway applications, and once a DC system is in place, converting it to AC is generally considered too large a project to contemplate. [Encyclopedia Lockergnome]