Some more train can be introduced and extended to Allahabad City like:-
Varanasi Ranchi Express
Varanasi Rajgir Express
Manduadih Gorakhpur Intercity
Manduadih Muzaffarpur Bapudham Express
Some...
more... new train can be introduced like:-
Allahabad City Dhanbad Express via Gaya
Allahabad City Chappra Intercity via Mau
Prayag Ghat in NCR can get terminate train like:-
Allahabad New Delhi Prayag Raj Express
Allahabad New Delhi Duronto Express
Allahabad Lucknow Ganga Gomti Express
Allahabad Meerut City Sangam Express
Dehradun LInk Express
Allahabad Udhampur SF Express
Allahabad Jaipur SF Express
Prayag Chandigarh Unchahar Express
Prayag Bareilly Express
Allahabad Basti Manwar Sangam Express
Allahabad Saharanpur Nauchandi Express.
Having 5 PF it can easily handle many train originating from Allahabad and can be the ideal terminal for many Allahabad originating trains.
Concept much more sensible than making Subedarganj as a terminus just railways need a track of 10m to join Prayag Ghat and the line leading to Allahabad Jn from Prayag.
The track doubling is almost done from Prayag to Allahabad.