[blackoil]

Tatkal tickets are special tickets that are opened two days before date of travel at 9 in morning. These are important tickets as a last chance for some urgent travel because usually trains are full long back. To prevent abuse there are lots of restrictions, including not available on any third party.

It was a lame app that prefilled the form in Railway app and charged money for this feature. This must have triggered some TnC breach. Similar things exist as browser plugin/scripts, but they are free and stay under the radar.