Nizam's Guaranteed State Railway (NGSR) was a railway company operating in India from 1883 to 1950. The company began with a line built privately by the HEH, the Nizam, which was owned and operated by the company under a guarantee from the Hyderabad State. Capital for the line was raised by issuing redeemable mortgage debentures. The Nizam's railway was eventually consolidated with the Hyderabad-Godavari Valley Railway (HGVR). In 1951, both the NGSR and the HGVR were nationalised and merged into Indian Railways.
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