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Zone formation
Around 1950, legislation was passed allowing the central government to take over many of the independent railway systems that were in operation.
In 1951, the following zones were created:
SR — April 14: From Madras & Southern Mahratta Rly., South Indian Rly., and Mysore State Rly. (about 9660 km).
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— Nov. 5: From the GIPR, the Nizam's State Rly., and the Scindia and Dholpur Rly. (about 8690 km).
WR — Nov. 5: From the BB&CI Rly., the Saurashtra, the Rajasthan, the Jaipur, and the Cutch Rlys. (about 9120 km).
In 1952, the following zones were created:
NR — April 14: From the Jodhpur Rly., Bikaner Rly., three divisions of the East Indian Rly. north-west of Mughalsarai, and the Eastern Punjab Rly. (about 9670 km).
ER — April 14: From the rest of the East Indian Rly. (east of Mughalsarai) and the Bengal Nagpur Rly. (about 9120 km).
NER — April 14: From the Oudh-Tirhut Rly., the Assam Rly., and the Kanpur-Achnera section of the BB&CI Rly. (about 7660 km).
In 1955, the South-Eastern Railway is carved out of ER:
SER — August 1: ER retains three divisions of the old East Indian Rly. and the Sealdah division of the old Bengal-Assam Rly. (about 3740km); the rest becomes SER (about 5380km).
In 1958, the Northeast Frontier Railway was carved out of NER:
NFR — Jan. 15: the former Assam Rly. lines in the Pandu region are split off from NER to become the NFR (about 3730km).
In 1966, South-Central Rly. was carved out of SR:
SCR — Oct. 2: The former Nizam's State Rly. network (by then the Secunderabad and Solapur divisions of SR) and part of the former Madras & Southern Mahratta Rly. (by then the Vijayawada and Hubli divisions) are split off from SR to become the South-Central Rly. (about 6070km).
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