For SER i can say, conversion of following Passenger trains to Express is not possible easily as these r daily passengers trains and will have huge protest from Daily passengers and common passengers if these trains are converted to Express trains and some stoppages of these trains are removed. The following passenger trains which cannot be possible now to be converted to Express at present are:
1. HWH-ADRA RANI SHIROMONI PASSENGER.
2. HWH-BHADRAK BAGHAJATIN FAST PASSENGER.
(STILL...
more... NEEDS DISCUSSION ON EXTENSION IF ANY IF POSSIBLE)
Also, if these trains r converted to Express trains there will be a huge drop in patronage of these trains and will cause difficulty to passengers also.
The following SER Passenger trains can be converted to Express Express trains and few stoppages can also be removed for them.
1. HWH-CKP PASSENGER.
2. HWH-BKSC PASSENGER.
3. HWH-PURI PASSENGER
( With stoppages removal required many and can be thought of addition of Sleeper coaches on experimental basis).
4. KGP-HTE PASSENGER
(SOME STOPPAGES CAN BE REMOVED ALSO BECAUSE PASSENGERS OF KHARAGPUR AND OTHER STATION WHO WANTS TO GO TOWARDS HATIA HAVE AN ALTERNATIVE OPTION OF KHARAGPUR-RANCHI MEMU PASSENGER TRAIN ALSO).
5. KGP-KHURDA ROAD PASSENGER
( AN EXTENSION TO NAYAGARH TOWN CAN BE REVIEWED).
6. TATA-ITWARI PASSENGERS
7. TATA-BILASPUR PASSENGER
8. TATA-HATIA PASSENGER
( STILL NEEDS DISCUSSION)
9. ROURKELLA-PURI PASSENGER
( NEEDS DISCUSSION IF IT WILL BE FEASIBLE IF CONVERTED TO EXPRESS)
Note: These r just my opinion.