Here is a list of the longest passenger trains operated by different zones:
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NWR ----- .
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WR ------ 59460 ----------- Veraval Junction – Mumbai Central = 925 Kms.
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more...

SER ----- 58111 ---------- Tatanagar Junction – Itwari Junction = 877 Kms.
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CR ------- 51422 ----------- Nizamabad – Pune Junction = 772 Kms.
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SWR ---- 56503 ------------ Bengaluru Cantt. – Vijayawada Junction = 749 Kms.
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ER ------ 53041 ------------ Howrah Junction – Jaynagar = 719 Kms.
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SECR ----- 18236 ---------- Bilaspur Junction – Bhopal Junction = 719 Kms. (Express cum Passenger)
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NER ----- 55322 ---------- Ramnagar – Varanasi Junction = 704 Kms.
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WCR ----- 59811 ----------- Ratlam Junction – Agra Fort = 694 Kms.
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NR ------ 54233 ----------- Faizabad – Saharanpur Junction = 647 Kms.
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SCR ---- 57305/57325 ----- Kacheguda – Guntur Junction = 624 Kms.
Also -------- 57561 ---------- Kacheguda – Manmad Junction = 624 Kms.
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ECoR ----- 58530 ---------- Visakhapatnam Junction – Durg Junction = 566 Kms.
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SR ------- 56320 ------------ Coimbatore Junction – Nagercoil Junction= 533 Kms.
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KR ------ 50106 ------------ Sawantwadi Road – Diva Junction = 465 Kms.
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ECR ----- 53525 ----------- Barkakana Junction – Varanasi Junction = 455 Kms.
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NCR ----- 54159 ---------- Jhansi Junction – Allahabad Junction = 391 Kms.
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NFR ----- 55616 ------------ Silchar – Guwahati = 379 Kms.
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Exceptions:
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CR ---- 59386 Slip – Chhindwara Junction – Amritsar Junction = 1546 Kms.
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SECR ---- 59386 Slip 2 – Chhindwara Junction – Gorakhpur Junction = 1190 Kms.
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The reasons for exceptions are:
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1. CWA-ASR slip is shown as CR rake, though it starts at a SECR station, gets attached to a SECR train 18237 and terminates at a NR station. So I wasn't sure of the CR mention, so kept it as exception.
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2. CWA-GKP slip gets combined to 11015 which is a CR-LHB train. This slip portion was SECR-ICF coach. Now recently it says that it gets combined with LHB coach S13 to 11015. So does that mean 59386 itself being a ICF train, has a LHB coach attached to it from CWA to ET?
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3. Now coming to 59386 itself - It's a ICF WR passenger.
- ASR portion: as said above is shown as belonging to CR and is termed as Exp. Why the Exp. part as the main train and the other slip (GKP) is termed as Passenger? Also who would maintain it? SECR, NR or WR?
- GKP portion: Does a LHB coach get attached to this WR ICF train and that gets detached at ET? Or are the passengers transferred to S13 of 11015 at ET? What about UR; were there any that used to be attached before 11015 became LHB?
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Due to this complexity, I mentioned it as exceptions.
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I have done it to the best of my knowledge, please comment if you find any mistake. Thanks.
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