Up front they share same cabin with 18 first class seats. (travelskills.com)
As per the offer, if you are traveling with a companion and sharing same cabin then your companion will only have to pay the half of the published tariff. (indianluxurytrains.com)
In relative term what it effectively means that for a journey costing USD 100 per person will now cost USD 150 person for 2 saving USD 50 if you are traveling with a companion and sharing same cabin. (indianluxurytrains.com)