Railgarion ki Devi, Nanda Devi AC ko pranaam - Sunaina Malhotra

25 Important and significant trains:
1. Deccan Queen
2. Grand Trunk Express
3. Golden Temple Mail (earlier Frontier Mail)
4. Kalka Mail
5....
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Mussorie Express
6. Howrah-Chennai Mail
7. Chennai-Mumbai-Chennai Mail
8. Coromandel Express
9. Howrah Mail
10. Howrah-Mumbai Mail
11. Rockfort Express (earlier MG)
12. Rameshwarm Express linking Madras to Rameshwaram going upto Dhanuskodi (now underwater)
13. Punjab Mail from Dadar via NGP/ET/MTJ (military cantonments)
14. Tamilnadu Express
16. Karnataka Express
17. Kerala Express
18. Nilgiri Express upto Mettupalayam
19. NMR - Mettupalayam - Ooty NG
20. Kalka Shimla Express, connecting Kalka Mail
21. Paschim Express, connecting ASR (Amritsar to Mumbai) on certain days, and direct from Delhi on certain days (carrying AC Chair cars)
22. Howrah AC Express on similar lines like Paschim Express
23. Pink City Express Delhi-Jaipur-Delhi
24. Trivandrum Mail (MAS - TVC - MAS)
25. AP Express
26. Pearl city Express (MAS -Tuticorin port )
27. Jammu Mail (NDLS/DLI - JAT) strategic train for army connecting kashmir
28. Darjeeling Mail (connecting HWH to DBRT)
29. Fairy Queen (DBRT to Darjeeling Town)
30. Madras Bangalore Mail
31. Tinsukia Mail ???? it was there earlier as a MG link to Howrah
32.
Note Paschim/HWH AC express were replaced by Rajdhanis...
I have written from memory about important trains from the British period which linked the important Presidencies as Bombay, Howrah, Delhi, Madras was known.. The mail trains had precedence over other trains because they carried British rulers' mails....
Open to better information !
Good question and informative too.. Made me scratch my head about IR..
Good wishes.

List of important trains can be classified depending upon many factors. They may be important historically, commercially, religiously, tourist spot, traffic wise, speed wise, day trains, night trains, inter state trains, within State trains etc.
There are number of important trains one can name either originating or terminating in Gujarat from other important places of India. There are trains in Gujarat - having historical importance, commercial importantce, religious importance, British rule legacies, tourist spot etc.
Only few trains meet all the important cirterias and that list if any, one can try...
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out and post it. One may also post in brief relevent history to support his views for that train to appear in his such list. One may collate the information and post it category wise important trains. Good wishes.