In AC 2T, there are six berths per bay, with numbering starting from inner lower berth and ending with side upper berth. Divide the berth number by six and you can make out what is the type of berth. In this case 13 is the inner lower berth in the third bay and 14 is the upper berth above that.
One more info in AC 2T all the lower berths have odd numbers and upper berths even numbers.