Transport
Discover facts about transport. Small discoveries that change the way you see familiar things.
Transport
Where your lost luggage ends up
A bag’s barcode links it to its passenger and route, so staff can trace a misconnection and send it onward. If nobody claims it, unclaimed bags eventually…
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Valet attendants sprint frantically to fetch parked sedans
The sedan is parked out of sight; the valet has to fetch it before the customer’s patience runs out. That sprint is the final leg of the parking system,…
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Why a million-mile car can reset its odometer
A six-digit mechanical odometer rolls from 999,999 back to 000,000 when its final wheel turns over. The car hasn’t become new; the counter has simply run out…
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Some early radiator caps doubled as engine-temperature instruments
A motometer mounted above the radiator displayed the temperature of coolant vapor, warning the driver about overheating. These devices were useful before…
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A glow stick counts as a liquid at airport security
TSA applies its carry-on liquid limits to glow sticks because of what is sealed inside them. The plastic wand may look more like a toy than a bottle, but its…
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An ambulance can need a specialist recovery truck
An ambulance carries equipment and a patient compartment that can make it heavier and more complicated to recover than an ordinary car. The rescue vehicle…
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Chocks prevent parked vehicles from rolling
The wheel meets the chock before it gets a chance to roll away. Its wedge shape turns the vehicle’s forward push into pressure against the ground, holding it…
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A tire thump cannot tell a trucker the pressure
A strike can reveal an obviously flat tire, but sound is not an accurate pressure reading. Truck tires need a gauge check while cold, because heat changes the…
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London briefly ran a cable-pulled railway beneath the Thames
The Tower Subway opened in 1870 with a small carriage pulled through a narrow tunnel by cable. Keeping the power source outside avoided putting a steam…
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Tuk-tuk drivers steer enclosed cabins using handlebars
The handlebars connect to the front wheel through a steering column, just like a two-wheeler’s controls. The driver gets a roof and walls, but the steering…
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Sound waves move energy without transporting matter
A sound wave makes nearby air molecules jiggle back and forth; each one nudges the next, passing the disturbance onward. The energy travels across the room…
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The oldest surviving Earth globe leaves out the Americas
Martin Behaim's globe was made in Nuremberg in 1492, before news of Columbus's voyage reshaped European maps. Europe and Asia face across a world with the…
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A freight train can need a mile to stop
A long freight train carries enormous momentum, while steel wheels have limited grip on steel rails. Brakes must shed that energy without simply locking the…
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How a spiral lifts water uphill
A turning screw traps water in the spaces between its spiral blade and its casing, then carries those pockets uphill. It’s an ancient water elevator: no…
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Lenin's famous train journey had a border drawn in chalk
In 1917, arrangements for crossing Germany gave the revolutionaries' carriage a special extraterritorial status. A chalk line marked the separation, and…
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Some offshore hotels hold position with thrusters instead of an anchor
Dynamic-positioning systems use position sensors and controlled propulsion to counter wind, waves, and current. For vessels housing offshore workers, staying…
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Why Victorian carriages had secret compartments
Hidden spaces tucked into a carriage’s bodywork kept valuables away from curious eyes. A thief saw polished panels and cushions; the owner saw a traveling…
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Why armored cash vans can keep driving after a blowout
Run-flat inserts inside the tires support the van after air escapes, keeping the wheel off the road. That gives the driver time to reach safety instead of…
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Why the ISS has a tiny acoustic guitar
A small guitar fits into the station’s tight storage spaces, and its acoustic body needs no amplifier in the pressurized cabin. Even in orbit, a crew can take…
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Riser pads increase clearance between the deck and wheels
Riser pads raise the deck away from the wheels, giving them more room when the board turns hard. Without that clearance, a wheel can bite the deck and…
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Straddle carriers drive over their cargo
A straddle carrier is a forklift built like a giant doorway: its legs roll around a container, then a hoist lifts the load inside the frame. The cargo rides…
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Railway barcodes once used colored stripes instead of supermarket lines
The KarTrak system identified freight cars with reflective labels read by trackside scanners. Red, blue, and white strips encoded information as the cars…
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Why Kim Jong-un travels in an armored train
The train’s reinforced cars and guarded route make the trip harder to disrupt than an ordinary journey. It trades speed for control: a head of state traveling…
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Pop-up headlights changed the car's shape after dark
With the lights lowered, the nose could stay low and smooth. Raise them and extra surfaces stick into the airflow, adding drag. The styling trick gave the car…
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