What is the purpose of the V-shaped rail between two straight rails on a railway? - Quora

Why do they often use more than one train engine to pull a train, rather than building one big enough engine to do the work of two or three? - Quora

How do engineers prevent trains from experiencing serious accidents since throughout the day and night the train tracks expand and contract according to fluctuations in temperature and could induce derailment? - Quora

What is the reason behind Japan's Shinkansen bullet train having narrow gauge tracks compared to other countries' high-speed trains? - Quora

What is your favorite NYC subway line and why? - Quora

What is the purpose of the V-shaped rail between two straight rails on a railway? - Quora

How much of an obstruction does it take to derail a train? - Quora

How are the rails of a railroad track bent to make the track curve? - Quora

What's the reason of those iron fits between rail tracks? - Quora

Where is the engine located on a train? - Quora

What is the purpose of the V-shaped rail between two straight rails on a railway? - Quora

What is the purpose of the V-shaped rail between two straight rails on a railway? - Quora

Why did the early steam locomotives have a funnel-shaped smoke stack? - Quora