Truck: two-axle chassis connected on a pivot to the main chassis, allowing the car to go around curves.
Inflated carrying tire: tire inflated with compressed air.
Current bar: part that slides along the electric circuit.
Inflated guiding tire: tire inflated with compressed air that guides the car along the track.
Guiding bar: track along which the guiding tires roll.
Runway: track along which the guiding tires roll.
Running rail: track along which the safety wheels roll.
Steel safety wheel: security wheel.

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A subway or metro system is a railway, usually in an urban area, with a high capacity and frequency of service, and grade separation from other traffic. In most parts of the world these systems are known as a "metro", in London the system is called the "Underground", while in most of North America and in Glasgow, Scotland it is a "subway".

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