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How does a cable car work?

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Quick answer

A cable car is a cabin hung from overhead steel ropes and pulled by a moving haul rope. An electric motor in one station turns a large bullwheel that drives the rope loop, while counterweights keep it taut. Towers with pulleys support the ropes, letting cabins carry passengers up mountains and across valleys or rivers.

A cable car works by hanging cabins from steel ropes strung between towers and pulling them along with a moving haul rope driven by a large electric motor in one station. A wheel at the other end keeps the loop tight, so cabins can climb steep slopes, valleys and rivers without roads.

Step by step

  1. An electric motor in the drive terminal turns the bullwheel, setting the haul rope loop in motion.
  2. In a gondola system, each cabin's grip clamps onto the moving rope as it leaves the station.
  3. The rope carries cabins over towers, where grooved sheaves guide it and hold it at the correct height.
  4. At the far terminal, the rope wraps round a return wheel kept under tension by counterweights or hydraulics.
  5. Arriving cabins detach and slow on tyre conveyors so passengers can step off before the cabin returns.

Key things to understand

  1. A powerful electric motor in the drive station turns a large grooved wheel called a bullwheel.
  2. The bullwheel moves a continuous steel haul rope that loops between the two terminal stations.
  3. Counterweights or hydraulic rams at one terminal keep the rope at a constant tension despite load and temperature changes.
  4. Towers along the line carry the ropes on sets of grooved pulleys called sheaves, holding the cabins above the ground.
  5. Cabins either grip the moving haul rope or ride on fixed track ropes while the haul rope pulls them.

Labelled diagram

  1. Drive bullwheel

    Large motor-driven wheel in one station that moves the haul rope.

  2. Haul rope

    Continuous steel loop that pulls cabins between the two terminals.

  3. Towers and sheaves

    Grooved pulleys on tall towers support the rope above the terrain.

  4. Cabin grip

    Clamp that fastens each cabin to the rope and releases it in stations.

  5. Tension station

    Counterweight or hydraulic ram keeps the rope tight as loads change.

Rope loop that drives a cable car

Real-world examples

  • The Gulmarg Gondola in Kashmir carries skiers and tourists in two stages up the slopes of Mount Apharwat.
  • Urban gondolas such as Medellin's Metrocable in Colombia link hillside neighbourhoods to the city metro.
  • The Peak 2 Peak Gondola in Whistler, Canada, crosses a valley between two mountains on long unsupported spans.
  • Many hill-temple ropeways in India, such as those to mountaintop shrines, spare pilgrims a long uphill walk.

Common mistake

✗ Myth: Each cable car cabin has its own engine that climbs the rope.

✓ Fact: The cabins are unpowered. A single motor in the drive station moves the whole rope loop, and every cabin is simply pulled along by gripping that rope.

People also ask

How do cable cars stay on the cable?
Each cabin hangs from a carriage whose grooved wheels or grip sit over the rope, so gravity keeps it seated. Grips clamp the rope with strong springs, and tower sheaves are fitted with guides and catchers that hold the rope in place if it tries to leave the pulleys.
How are cable cars powered?
Cable cars are powered by an electric motor in one terminal that turns a large bullwheel, moving the entire rope loop. Gearboxes match motor speed to rope speed, and brakes hold the wheel when stopped. A backup engine can turn the wheel slowly to return cabins during a power cut.
Why don't cable car ropes break?
Haul and track ropes are made of many twisted steel wires and are designed to carry several times the greatest load they will ever see. Operators inspect them regularly, often with magnetic testing that detects broken wires inside, and replace or splice sections long before strength falls to unsafe levels.
What is the difference between a gondola and an aerial tramway?
A gondola has many small cabins circulating on a single moving loop, detaching from the rope in stations so passengers can board. An aerial tramway has usually two large cabins that shuttle back and forth on fixed track ropes, pulled by a separate haul rope.
What happens if a cable car loses power?
Cable cars carry backup diesel engines or auxiliary motors that can slowly bring cabins back to the stations. Brakes on the bullwheel hold the system in place, and operators also train for evacuating passengers by rope if needed.
How do gondola cabins slow down in the station?
Detachable gondola cabins release their spring-loaded grip from the fast-moving rope as they enter the station. Rows of tyres then slow them to walking pace for boarding, before speeding them up and reattaching them to the rope.
Is a San Francisco cable car the same thing?
Not quite. San Francisco's cable cars run on rails in the street and use a grip that clamps onto a cable moving in a slot beneath the road. Aerial cable cars hang in the air from overhead ropes instead.

Part of the guide: Cars, Trains, Planes & Ships →