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'Purtabore Stone Quarries Tramway' info and link added
The location of the bridge between Naini and Allahabad had been decided as early as 1855. The actual work began in 1859 and the bridge was opened for public on August 15, 1865. By then, rail lines on both sides of the bridge to [[Delhi]] and [[Howrah]] was almost complete. The length of the bridge is 3,150 feet. It comprises 14 spans of 200 feet and two of 60 feet. The bridge has a railway line on the top and a roadway beneath. It was designed by engineer [[Alexander Meadows Rendel]]. The depth of foundation below is up to 42 feet and the height from low water level to underside of girder is 58.75 feet. The weight of the girder is 4,300 tons. It is estimated that about 2.5 million cubic feet of masonry and brick work was used in it.
<ref>[http://wikimapia.org/8292028/Old-150-year-old-Yamuna-Bridge Wikimapia "Old Yamuna Bridge (Allahabad) "]; Retrieved 23 Apr 2016</ref>
The stone for the bridge construction was from the [[Purtabore Stone Quarries Tramway|Purtabore Stone Quarry]] where a tramway carried the stone to the bank of the River Jamuna for shipment to the site <ref name =UP04>“Industrial Railways and Locomotives of India and South Asia” compiled by Simon Darvill. Published by ‘The Industrial Railway Society’ 2013. ISBN 978 1 901556 82-7. Available at http://irsshop.co.uk/India. Reference: Entry UP04 page ....</ref>..
In 1927-29, the old girders were replaced by new ones and the lower deck was added for roadway services. The upper deck being the two lane railway line which connects Naini Junction railway station to Allahabad Junction railway station
