How are underground railways built?
Under the cities lie the foundations of large buildings and many pipes which transport water, gas electricity and telephone cables. Underground railway builders have two options. They can either dig deep tunnels or they can run the railway under the existing roads. In the latter, a large trench is dug along the road and closed again after the railway is built.
Related posts:
Do you know “Only Asian in ITWA”.
Do you know
Which animal did the Mayans worship? Complete General Knowledge Question and Answer for Class 6, 7, ...
General Knowledge
GK Question "What Is Earth Made Of?" general knowledge book English 2021 current affairs quiz and an...
General Knowledge
Which were the smallest dinosaurs? Complete General Knowledge Question and Answer for Class 6, 7, 8,...
General Knowledge
GK Question "How Does A Flying Fish Manage To Fly?" general knowledge book English 2021 current affa...
General Knowledge
Why does a hologram appear three-dimensional?Complete General Knowledge Question and Answer for Clas...
General Knowledge
GK Question "First Of All, I When Were The Rockets Used?" general knowledge book English 2021 curren...
General Knowledge
What is a four-wheel drive? Complete General Knowledge Question and Answer for Class 6, 7, 8, 9, 10,...
General Knowledge
Were the Celts able to read and write? Complete General Knowledge Question and Answer for Class 6, 7...
General Knowledge
GK Question "How Glass Was Discovered?" general knowledge book English 2021 current affairs quiz and...
General Knowledge
Which is the biggest planet?Complete General Knowledge Question and Answer for Class 6, 7, 8, 9, 10,...
General Knowledge
How many kinds of apples are there? Complete General Knowledge Question and Answer for Class 6, 7, 8...
General Knowledge
When was plastic made first? Complete General Knowledge Question and Answer for Class 6, 7, 8, 9, 10...
General Knowledge
Do you know "Smuggling wares on display at Alfandega, Goa".
General Knowledge
Updated List of Top 10 rich person in the world.
General Knowledge
Which animal abandons its babies very early? Complete General Knowledge Question and Answer for Clas...
General Knowledge
Do you know “The first digitised version of the Ramayana”.
Do you know
Do you know “Youngest girl to scale Mt Everest”.
Do you know
Do robots have uses in industry? Complete General Knowledge Question and Answer for Class 6, 7, 8, 9...
General Knowledge
Why do tidal waves occur? Complete General Knowledge Question and Answer for Class 6, 7, 8, 9, 10, 1...
General Knowledge