Earlier, the slip coaches used to run as biweekly between Vishakhapatnam and Manmad by attaching these coached to Kakinada-Manmad exp at Vijayawada. At VSKP, these coaches used to be attached to Bilaspur-Tirupati exp on Tuesdays and Puri-Tirupati exp on fridays.The same coaches used to be detatched at VSKP in the return direction. I checked from official train website which now shows that these slip coaches run from Puri-Manmad on Fridays and Bilaspur-Manmad on Tuesdays. But in the return direction, it is showing from Manmad to Vishakhapatnam only. Don't know why this discrepancy?
Also note that, when you try to book a ticket from Puri to Manmad on Fridays in irctc, it displays the train name when "find trains" is clicked...
more... by selecting Sleeper class. But when you click on show availability, it displays "Class Not exist" Message. This means, you can't book ticket from Puri to Manmad for now.But you can book the tickets from VSKP. Even the train timetable released by Indian railways displays the slip coaches running between VSKP and Manmad.