How to buy train tickets in Indonesia?

I'm Indonesian and I transport by train weekly. Now you can book your ticket easily via mobile application named KAI access (it's the official!), from there you can choose all the schedule-train-and payment method, even more if you need food on train or porter to help you bring the luggage, you can book there too!

This is the internet answer, I have no local knowledge at all. The site of the Man in Seat Sixty-One has this page about buying tickets in Indonesia.

The site ticket.com does accept international credit cards, as does the site Mau Ke Mana, there is one more site on that same part of the page, the official railway page for Indonesia, but that seems often not to accept international credit cards.

And there is the option of buying tickets at a railway station in Indonesia, as far as I understand you can do that at any station, also in advance. But as said, my only information is from internet.

I've been travelling by train in Indonesia quite a few times. I've been buying train tickets for others as well in Indonesia. Buying tickets for trains and flights can often be a hassle in Indonesia. Often the train company (KAI) or the airlines offer tickets on their own websites, thereby advertising with credit card logos of MasterCard and Visa. Paying is often not a problem with an Indonesian debit or credit card. When using a foreign credit card, however, payment is often declined.

My best experience is using reseller Traveloka for buying train tickets and airline tickets for airlines other then Garuda Indonesia and AirAsia. Yes, they take a small fee for selling you the ticket but I never had an issue obtaining a ticket with a foreign card.

The reseller tiket.com accept the following payment method, , So, If you have any of the cards from above you can just try using this website. Beside the official website there are many other private website which too helps in booking ticket, The basic difference between the option is, If you are directly buying from the official website, They will charge you the normal charges. Whereas, If you are booking through private website they may give you some discount but they also charge more money if deadline for the ticket is nearby in few weeks. I would suggest you to use the official website for booking ticket as there were will be no additional useless charge taken from you, If you are nearby deadline. There rules work based on the availability of seats, So, If they have seat you will get it when reaching the deadlines nearby in few weeks and if they won't have then they will not charge any additional charges or taking more money for just reserving the seat.