This kind of business may be called as becoming a reseller or even a drop shipper because you are not the first seller of the tickets. Everyone can run this business, from students to even an employee who still needs more money. You can do this business anywhere you want, at the place you are at, with the unlimited time. The ways to sell train tickets are divided into 2 ways. They are selling them yourself and selling them with a intermediary.
This kind of business does not need too high budget to start over. It will not reach IDR 1.000.000 but it is just about hundreds rupiahs.
You may sell it to your family or your close friend, then you can start with a wider area. There are a lot of software you may find on the internet and also the provider who can help you to run your business. This business really beneficial especially there are many people who want to go to certain place by train but does not know how to order train tickets. This thing may be a shameful but it is the reality for some people. On the other hand, there are also a lot of people who do not have much time to make an order for train ticket themselves, because they are super busy with their job.
You can promote your business on the internet and it is a warning for you for not offering the tickets with a super high cost, if only you do not want to lose your chance of amount of customers.
When you offer a ticket reservation to your customers, first, ask them about where they would like to go. Then, ask them whether they have their own favorite train. After that ask them the class of the train they wish they are in. After that, if it is possible ask them about the cost range of the train ticket reservation.