Compiling a list of value for money Mail/Express trains ( with run compared to/better than some pseudo SF trains ):
1. Bandra (T) - Jammutawi Vivek Express
2. East coast Express
3. Secunderabad - Darbhanga Express
4....
more... Bandra (T) - Gorakhpur Humsafar
5. Tirunelveli - Jamnagar Express
6. Jhelum Express
7. Godan Express
8. Pune - Bhagat ki kothi Express
9. Bikaner - Yesvantpur Express
10. Konark Express
11. Lokmanya Tilak (T) - Ranchi Express
12. Chhatrapati Shivaji Maharaj (T) - Nagercoil Balaji Express ( via Renigunta )
13. Kamayani Express
14. Lokmanya Tilak (T) - Karaikal Express
15. Lokmanya Tilak (T) - Bareilly Express
16. Lokmanya Tilak (T) - Raxaul Antyodya Express ( via Patliputra )
17. Tapti Ganga Express
18. Ahmedabad - Asansol Express
19. Ahmedabad - Barauni Express
20. Pawan Express
21. Porbandar - Secunderabad Express
22. Lokmanya Tilak (T) - Guwahati Express ( via Malda Town )
23. Lokmanya Tilak (T) - Vishakhapatnam Express
24. Jasidih - Pune Express
25. Kaveri Express
26. Hatia - Bangaluru Cantt. Express
27. Uzhavan Express
28. Silambu Express
29. Shramik Express
30. Purna - Patna Express
31. Vishakhapatnam - Bhagat ki kothi Express
32. Durg - Ajmer Express (18213/14)
33. Bhagalpur - Ajmer Express
34. Yesvantpur - Gorakhpur Express ( via Ayodhya Cantt )
35. Gorakhpur - Pune Express ( via Prayagraj )
36. Pune - Darbhanga Express
37. Mysuru - Varanasi Express
38. Varanasi - Hubballi Express
39. Gorakhpur - Panvel Express
40. Lokmanya Tilak (T) - Gorakhpur Express ( via Varanasi )/( via Barhni )
41. Pune - Gorakhpur Express ( via Lucknow )
Add more trains to the list.
This list is a cheat sheet for IR admin to earn more money by converting many of them to Super Fast with minor tweaks in TT.
Concluding the list, CR is the most passenger pocket friendly zone, running some of the most economical trains (majority of them from LTT)