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WHEN AND WHERE WAS THE FIRST SECTION OF THE UNDERGROUND RAILWAY OPENED IN THE WORLD. EXPLAIN ANY THREE DIFFICULTIES OF TRAVELLING IN THAT UNDERGROUND RAILWAY.

1. Underground railway was considered a menace to health.
2. People who were smoking pipes pollute the atmosphere.
3. The atmosphere in the railway was a mixture of sulphur , coal dust and foul fumes from the gas lamps above.
4. Due to lack of oxygen atmosphere often became suffocated