when and where was the first section of the under ground railway opened in the world? explain ant three difficuties of travelling in that under ground railway.
1.The Compartments would be over crowded and too hot.
2. The atmosphere was polluted with a mixture of sulphur, coal and dust with fuel fumes from the gas lamps.
3. Many felt that underground railways were like iron monsters which brought mess and unhealthiness to the city. There would be suffocation due to lack of oxygen supply and heat.