It uses mostly Advanced Light Rapid Transit (ALRT) technology, an automated rail system that operates mainly on a raised guideway, although some sections run underground or at street level.

The Vancouver Skytrain is a fully automated, driverless light rapid transit system that uses advanced "Linear Induction Motor" (LIM) technology. Unlike traditional trains that use wheels driven by an internal motor, a LIM train uses electromagnetic "attraction and repulsion" between a motor on the bottom of the train and a metal "reaction rail" in the center of the track. This allows the train to accelerate and decelerate smoothly regardless of weather conditions or "wheel-slip," which is essential for Vancouver's rainy climate and steep grades. The entire system is controlled by a centralized computer system at the Operations and Maintenance Centre, which monitors the location and speed of every train in real-time. Because there is no driver, the trains can run at extremely high frequencies—sometimes as often as every 90 seconds during peak hours. Power is typically supplied via a "third rail" or an overhead catenary, depending on the specific line. For the passenger, the system works via a "tap-on/tap-off" Compass Card, with the trains operating on a "grade-separated" track (elevated or underground) to ensure they never interact with street traffic.

Of course! The “Skytrain” can refer to several automated, elevated rail systems around the world, but the most famous are Vancouver’s SkyTrain in Canada and Bangkok’s BTS Skytrain in Thailand. Since you didn’t specify, I’ll explain both, as they share core principles but have key differences.

Core Concept: How a “Skytrain” System Works

At its heart, a Skytrain is an elevated, fully automated, rapid transit system. The “Sky” part comes from most of its tracks being on elevated guideways above city streets, avoiding ground-level traffic.

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1. Vancouver’s SkyTrain (Canada)

This is the original and one of the longest fully automated rapid transit systems in the world.

• Propulsion & Technology: It uses Linear Induction Motor (LIM) technology. Instead of a traditional rotating motor, the train has a flat electromagnetic stator. It interacts with a reaction rail (a flat aluminum plate) mounted on the track, pulling the train forward. This allows for steep climbs, tight turns, and quieter operation.
• Automation: It’s fully automated (Grade of Automation 4/GoA4). There are no drivers in the cabs. Operations are controlled centrally from a control room.
• Power Supply: Electricity is supplied via a third rail beside the track.
• Guideway: Primarily elevated on concrete guideways, with some at-grade and underground sections in downtown Vancouver and newer extensions.
• How to Use:
  1. Buy a Compass Card or ticket at station kiosks.