Well havent travelled by any of the premium except for shatabdi-ok here is the list of longest journeys
Shatabdi- 12007-08 & 12028 Bangalore to Chennai (360 kms) and 12008 Mysore to Bangalore (139 kms)
Double Decker- 22625 Chennai to KJM (350 kms)
Jan shatabdi- 12083 Mayiladuthurai to Erode 200 kms
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12658/57 Chennai to Bangalore 360 kms
Express- 11042 Chennai to Mumbai
Superfast- 12841/42 Corromandel Chennai to Howrah
Intercity- 16515 Bangalore to Subramanya Road (Longer duration)- 12608/07/39/40/09/10/77/78 Day Expresses
Passenger- 56513/14/241/42 SBC-SA/YPR-SA passengers (200 kms)
Classes:
2A- 16732/31(16235/36) Bangalore to Madurai 480 kms
3A- 11042 Chennai to Mumbai
FC- 56214 Chamrajnagar passenger Bangalore to Chamrajnagar 200 kms
SL- 12841/42 Corromandel Express Chennai to Howrah
CC- 12639/40/12007/08/12028/22625 Bangalore to Chennai
2S- 16515 Bangalore to Subramanya Road, 12608/07/39/40/09/10/77/78/12083/84 Express
UR- 56513/14 SBC-SA/DPJ-SA; 12609 SBC-MAS; 16516 HAS-YPR

MY LONG DISTANCE TRAVELLING END TO END
1.Trivandrum Rajdhani Express
2. Trivandrum New Delhi kerala Superfast Express
3. Kochuveli Chandigarh Kerala Sampark kranti Express
4. Ernakulam Nizamuddin Millenium Express
5....
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Ernakulam Nizamuddin DuruntoExpress
6. Nizamuddin Ernakulam Durunto Express
7. Trivandrum Lokmanya Tilak Netravati Express
8. Lokmanya Tilak Ernakulam Durunto Express
9. Kochuveli Bangalore Express
10. Bangalore Kochuveli Garib Rath Express
11. Chennai Central New Delhi Tamil Nadu Superfast Express
12. New Delhi Trivandrum Rajdhani Express
13. Chandigarh KOchuVeli Kerala Sampark Kranti Express
14. New Delhi Bhopal Shatabdi Express

Looking back the days, when i used to have argue with my friend regarding trains.I used to travel in bus to my hometown for Vacations whereas my friend travelled by train till his town(ZN).Most of my friends travelled by trains except me.i used to talk alot about my hometown APSRTC bus depot mainly Super luxury buses and comfort in travelling... after my 10th standard, for further studies,this time i had no option other than to travel by train to the college . Slowly my thoughts & feelings changed for railways because it showed me the true INDIA & its people. In my 12th class, i came to know about Both rajdhani & shatabdi trains from my friend who had travelled those trains .After hearing his journey experiences, i thought before i reach my 30's, i should complete in travelling in all different types trains & various classes...
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available in IR...
Till date
I have travelled only in SF, EXP, Metro & Passenger trains & not travelled in Raj, Shtb,J-Shtb,GR,Dur,DD,Premium..
Travelled in all most all classes (except executive chair car, FC).
My list of longest journey's
1.SF:- KGP TO WL (1323 Kms)_22849/50
2.MAIL:- KGP TO BZA (1115 Kms)_12839/40
3.EXP:- KGP TO WL (1323 Kms)_18645/46
4.AC :- KGP TO WL (1323 Kms)_12773/4
5.Passenger
i) fast :- SC TO MABD (201 Kms)_57625
ii)slow :- BZA TO WL (207 Kms)_57238

Classes
1.1. 1AC - 1115Kms (Falaknama exp)
2. 2AC - 595 Kms (Padmavathi exp,upgraded ticket)
3. 3AC - 1323 kms (SC-SHM AC exp)
4. SL - 1323 Kms(SC-SHM exp)
5. CC - 178 Kms (Golconda exp)
6. 2S - 207 kms ( Satavahana exp)
7. GEN - 595 kms (Krishna exp)
I am hoping that one day , i will complete travelling in all diff types of trains & classes of IR...

1ac in mandovi exp dr-rn n return and mahalaxmi exp cstm-jsp.
2ac bct-nzm rajdhani SPL, 12953ak rajdhani, sahyadri exp, tvc rajdhani. BCt adi passenger
3ac bct-ndls rajdhani, 12954 ak rajdhani, JP bct duro to, sahyadri exp, mahalaxmi exp, swaraj exp, kalka mail, ranakpur exp, Ajmer dadar sf. Cstm ANSI fast passenger
GR bdts dee gr, JP ypr gr SPL, ngp Pune gr
GR...
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CC kota to bvi in nzm bdts gr
ACCC karnavati, pragati exp, sinhagad exp, Gujarat exp, taj exp
Shatabdi ACCC ndls lko, ndls kalka, Asr ndls, BCt adi, Ajmer ndls
Shatabdi executive Asr ndls shatabdi
DD BCt adi DD exp
Sleeper sahayadri, mahalaxmi, Maharashtra SK, etc
Second sitting Surat bdts intercity only
First class bdts vapi passenger, Gujarat exp
General paschim exp ndls to bvi
Also travelled in fc, gen, 2s in klk sml and neural matheran trains
Missed many trains as such