For information, by car, there are 156km (97mi) for a journey of 3h30 to 5h30 (google does not really know). By train, it takes 3h45 and for the bus, 3h20.

I saw on the Internet these images of these trains bounding in the stations and the users running on the tracks to get on the platform. Or those crowded trains, those famous 3rd class. It must be said that it remains a bit confusing for a European who knows the 1st and 2nd class, sleeper trains or seats. In India you have many more classes that exist. I'll leave it to you to search on the Internet.
After having a little "struggle" to find the platform, we were able to wait for our train scheduled for 7:30 am. This train which will finally arrive at 8am. On the quays, do not look for signposts. You will just have the train number displayed. Fortunately, everything is painted on the wagons so there is no risk of making a mistake. Then, you have to run a bit to reach your "sleeper" wagon. No privacy, a single car with corners like compartments without walls and doors. Along the length of the train, sleeping berths. It's practical, there are clean sheets and above all electrical outlets to charge your phone. Regularly, street vendors pass.

The bus is another story. Seats that are not too hard but that go into a bunk position for sleeping during these long journeys. Sleep is a big word because engine noise can make you sleepy or startled. A great stop on the way for a "wee" break and a drink or a snack.
From time to time, street vendors pass at the foot of the bus to "supply" you.

We ended up with the city bus, which was even less comfortable, and finally, the very modern and very secure metro. A little anecdote. Before the arrival of the metro, people are well lined up in front of a rope waiting for the stop. But as soon as the doors open, it's a rush and it doesn't matter if people come down. Finally, I was almost in Paris...