Hello, my name is Naresh Kumar from Hisar, Haryana. A person asked whether the UDID card can be used for train travel and why it is not accepted. As far as I know, the UDID card is not yet fully valid for train travel. Therefore, it is not being accepted. For now, passengers should use an e-concession railway pass for travel. Once UDID is officially accepted in railways, the information will be shared. For more help, you can contact the helpline number: 880004334.