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<br>The NWR owned and operated an extensive network of railways of mixed gauge, and was the description applied for the actual NWR ‘NWR Proper’ lines plus a number of broad gauge ([[Rail_gauge#Broad_Gauge|BG]]) and narrow gauge([[Rail_gauge#Narrow_Gauge|NG]]) lines on behalf of other parties:-

<br>The line lengths of the ‘NWR Proper’ ( excluding lines on behalf of other parties) of Broad Gauge lines in 1918 was 3690 miles(5938km) and this had become 5769 miles(9284km) by 1937 divided into two sections :-* ‘NWR '''NWR Commercial Section’Section''', 2559 miles(4118km) by 1918 and 5769 miles(9284km) by 1937''as detailed below:- ''* ‘NWR '''NWR Frontier(Military) Section’Section''', 1151(1852km) by 1918 and named the ‘NWR Strategic Section’, 1555 miles(2503km) by 1937 ''as detailed below:- ''

Broad Gauge([[Rail_gauge#Broad_Gauge|BG]]), 1151(1852km) in 1918 described as the ‘NWR Frontier(Military) Section’; by 1937 this had become 1555 miles(2503km) and described as the ‘NWR Strategic Section’, . <br>'''[[Baluchistan Railways| ‘Baluchistan Railways’ BG']]''' and is the sub-heading used in the 1937 Reportcomprising:-* [[Sind-Pishin State Railway|‘Ruk-Chaman Mainline’]]. Recorded in the 1916 Report as the ‘[[Sind-Pishin State Railway]]’, 337 miles(542km). The ‘[[Quetta Link Railway]]’ was order by the British Government in 1876 as a strategic railway. The section from Ruk Junction to [[Sibi]] opened 1880, constructed by the SP&DR and named the [[Kandahar State Railway]], merged into NWR 1886; extended from [[Sibi]] via Mushkaf and Bostan 1887; to Killa Abdulla, 1888; reaching [[Chaman]] 1892 . The section from [[Mushkaf-Bolan Railway| Muskaf through the Bolan Pass]] was a major challenge as described in the page ‘[[Bolan Pass Railway Construction]] ’, the track was twice washed away and finally opened after reconstruction in 1887. Recorded in the 1937 Report as the ‘Ruk-Chaman Mainline’, 310 miles(499km)* ‘Sebi-Bostan (Harnai Route) Branch Line’, 134 miles(216km), originally named the ‘Sibi-Bostan Loop Line’, 109 mile(175km), from [[Sibi]] to [[Quetta]], opened 1882 and 1887, dismantled and realigned 1897; extended to [[Bostan]], 1887; Bostan Chord opened 1898.* ‘Spezand-Zahidan Branch Line’, 440 miles(708km, original section named the ‘[[Quetta-Nushki Branch Line]]’, 88 miles(141km),opened on November 15, 1905. An extension NWR Military Section from Spezand Junction near Quetta to [[Nushki]]. The line was extended to respond to Military demands and was completed to Duzdap (Zahidan) by 1927. ''See '' ‘[[Trans-Baluchistan Railway]]’ and ‘[[Nushki Extension Railway]]’ ''for details.''* ‘Bhaganwala Branch Line’, 11 miles(18km) from Haranpur to Bhaganwala, opened 1895. Listed in the “1918 Admin Report” under the ‘NWR Frontier Section’, ''not listed in the “1937 History of Railways”''* ‘Warcha Quarry Branch Line’, 8 miles(13km) from Gunjyal to Warcha, opened 1918. Listed in the “1918 Admin Report” under the ‘NWR Frontier Section’, ''not listed in the “1937 History of Railways”''* ‘Ghazi Ghat Branch Line’ 10 miles(16km), opened 1887 from Mahmud Kot to Ghazi Ghat. Listed in the “1918 Admin Report” under the ‘NWR Frontier Section’, ''not listed in the “1937 History of Railways”''

Based on the “1937, History of Indian Railways”<ref name=Hist157>[https://ia801605.us.archive.org/30/items/in.ernet.dli.2015.36650/2015.36650.India-Railway-Board-History-Of-Indian-Railways-Constructed-And-In-Progress.pdf US Archive .org pdf download of ‘History Of Indian Railways, constructed and in progress’, 31 March 1937 by ‘The Government of India - Railway Department’ page 157-171, pdf 196-210]; Retrieved 13 Sept 2020</ref>, and also where extra information is available from the “1918, Administration Report on Railways 1918” <ref name=Admin1918p106Admin1918p111>[https://archive.org/stream/BombayBarodaAndCentralIndiaRailwaySystem/Bombay_Baroda_And_Central_India_Railway_System#page/n119/mode/1up “Administration Report for Railways” pages 111-120 (pdf 119-128)]; Retrieved 13 Sept 2020</ref>

* ‘[[Bahawalnagar-Fort Abbas-Kut-Al-Imara Railway]]’, BG, 152 miles(245km). The [[Bahawalnagar-Fort Abbas Railway| ‘Bahawalnagar-Fort Abbas Section’]], 70 miles(112km), opened 1928 and extended to Kut-Al- Imara in 1931. Worked by NWR as part of the ‘NWR System’.

* [[Kohat-Thai Thal Railway | ‘Kohat-Thai Railway - Military Line’]], [[Rail_gauge#Narrow_Gauge|NG]], 62 miles(100km) opened in 1903 from Kohat to Thai. Originally part of the ‘[[Khushalgarh-Kohat-Thal Railway]]’, opened 1903 as a narrow gauge [[Rail_gauge#Narrow_Gauge|(NG)]] military railway;. The section from Khushalgarh to Kohat was converted to BG in 1908 and became part of the ‘[[Jand-Kohat Branch Line]]’ (listed in ‘NWR Branch Lines’ <ref>ibid page 176 pdf 215</ref>.