|Official name||Tunnel No. 9|
|Other name(s)||Lion's Mouth (සිoහ කට)|
|Location||Moragolla, Sri Lanka|
|Work begun||July 1863|
|Constructed||F. W. Faviell|
|Owner||Sri Lanka Railways|
|Design engineer||Guilford Lindsey Molesworth|
|Length||334 m (1,096 ft)|
|Highest elevation||400 m (1,300 ft)|
The tunnel was designed by Sir Guilford Lindsey Molesworth, the first Director-General of Railways in Ceylon (1865–1871) and constructed by F. W. Faviell. It is the last climb of the Kadugannawa Pass, and is considered to be one of the most dangerous and difficult construction projects along the railway line. The tunnel was bored from both ends meeting in the middle. Construction commenced from the Kandy end in July 1863 and the Colombo side in September 1863 and the works were completed on 22 March 1866, with over 7,894 m3 (10,325 cu yd) of rock excavated. The tunnel is 334 m (1,096 ft) long and contains a double curve.
- Perera, G. F. (1925). The Ceylon Railway: The Story of Its Inception and Progress. The Ceylon Observer. p. 98.
- Ratnasinghe, Aryadasa (3 January 1999). "A historic journey in 1864". Sunday Times. Retrieved 11 September 2017.
- Souvenirs of Ceylon: a Series of 120 Illustrations of the Varied Coast, River and Mountain Scenery of the Beautiful 'Eden of the Eastern Wave'. National Library of the Netherlands. 1869. pp. 220–221.
- Ceylon. Commission, World's Columbian Exposition, Chicago (1893). Official Handbook & Catalogue of the Ceylon Courts: With Map and Illustrations. H.C. Cottle. p. 83.CS1 maint: multiple names: authors list (link)
- "The entrance to tunnel called the Lion's Mouth going to Kandy". British Library. Retrieved 11 September 2017.