what is coach id in irctc

"Preferred Coach ID" is an optional preference provided by IRCTC during the booking of a train ticket. It allows passengers to select a coach of their choice, such as a lower berth or a coach near the pantry car. However, it is important to note that the availability of the preferred coach is not guaranteed and is subject to availability at the time of chart preparation. If you encounter an "Invalid Coach ID" error while booking a ticket, it may be due to the coach ID being unavailable or invalid. In such cases, you can try selecting a different coach ID or leaving the field blank.