This is why train wheels are not perfectly cylindrical, but slightly conical.

The reason why

A 100 year old steam locomotive looks as good today as the day it was built.

This is the kind of science, that should be used in schools. Hands on, easy to understand, and with important information, that will stick in your mind forever! 👍

That's the best creative performance 😳🤯👏👏

Evolution of train over the years.

This door is one of the oldest in the world located in the Pantheon in Rome, it was built in the year 118-126 AD, during the time of Emperor Hadrian. The gate consists of two wings, each made of solid bronze, weighs 8.5 tons, measures 7.6 meters high and 2.3 meters wide. Although the wings are extremely heavy, they are so balanced that a single person can easily open and close them. It is also one of the few doors in the world whose lock, dating back almost 2,000 years, still works.

Take a tour of this beautiful Saphir Odoriko train in Japan.

Fruit vendor protecting his grapes from train passengers in Bangladesh

This is what it looks like when a train changes gauge.

Physical laws involved. When an object with a rotating mass (such as a spinning wheel) experiences a force that tries to change its orientation, it responds by precessing, or rotating, in a direction perpendicular to the applied force. This is known as gyroscopic precession. So the conical shape of train wheels acts like a spinning gyroscope. When lateral force tries to tilt the wheels, the gyroscopic effect kicks in, pushing the wheels back to the track's center.