Gwalior in Madhya Pradesh is one of the few cities in India where horse-drawn carriages or tongas form a part of the public transport system. They ply on fixed routes. Many residents see them as part of the city
Links:
[1] http://admin.indiaenvironmentportal.org.in/feature-article/end-journey-gwaliors-tongas
[2] http://admin.indiaenvironmentportal.org.in/category/author/aparna-pallavi
[3] http://admin.indiaenvironmentportal.org.in/category/journal/down-earth
[4] http://admin.indiaenvironmentportal.org.in/category/thesaurus/transport
[5] http://admin.indiaenvironmentportal.org.in/category/thesaurus/public-transport
[6] http://admin.indiaenvironmentportal.org.in/category/thesaurus/urban-transport
[7] http://admin.indiaenvironmentportal.org.in/category/thesaurus/three-wheelers
[8] http://admin.indiaenvironmentportal.org.in/category/thesaurus/congestion
[9] http://admin.indiaenvironmentportal.org.in/category/thesaurus/tonga
[10] http://admin.indiaenvironmentportal.org.in/category/thesaurus/madhya-pradesh
[11] http://admin.indiaenvironmentportal.org.in/category/thesaurus/gwalior-t