Theory:

     The train had started punctually. Among the passengers were a number of officers, Government officials and merchants. Passepartout rode in the same carriage with Mr.Fogg, and a third passenger occupied a seat opposite to them. This was Sir Francis Cromarty, one of the friends Mr.Fogg made on the ship Mongolia that brought him to Bombay.
 
     An hour after leaving Bombay the train had passed the bridges and the Island of Salcette, and had got into the open country.
 
     During the night the train left the mountains behind, and passed Nassik, and the next day proceeded over the flat, well-cultivated country of the Khandesh, with its straggling villages, above which rose the towers of temples. This fertile territory is watered by many small rivers and clear streams, mostly tributaries of the Godavari.
Explanation:
 
Mr. Fogg's train started at the right time. A good number of officers, Government officials and merchants occupied the passenger list. Mr. Fogg's attendant Passepartout travelled along with him in the same carriage. The third passenger occupied the opposite place of them. The third passenger's name was Sir Francis Cromarty. Sir Francis happened to be Mr. Fogg's friend while he travelled on the ship of Mongolia that brought him to Bombay.
 
Journey by train.jpg
Journey by train
 
After an hour, the train left Bombay. It had passed the bridges and the Island of Salcette and had got into the open country. After some time, during the night, the train passed Nashik, leaving the mountains behind. And the next day, the train continued to cross over the flat, well-cultivated country of the Khandesh. The region of Khandesh is covered with villages. The villages were spread around and above which rose the towers of the temples. The fertile area of Khandesh was watered by many small rivers and clear streams, mostly from the tributaries of the river Godavari.
 
Meaning of difficult words:
 
S.No
Words
Meaning
1.
Punctually
At the right time and not late
2.
Passengers
A person who travels in a ship, bus, car etc. but not the driver 
3.
Official
A person in a position with authority
4.
Merchant
A person who sells and buys goods in large quantities
5.
Carriage
A wheeled vehicle
6.
StragglingSpreading out in various directions
7.
Territory An area or land belong to a country
Reference:
State Council of Educational Research and Training (2019). Term-3 English Standard-7. A Journey by Train by Jules Verne (pp. 79-85). Published by the Tamil Nadu Textbook and Educational Services Corporation.