Thar Desert natural vegetation of this dry area is classed as Northwestern thorn scrub forest occurring in small clumps scattered more or less openly. Density and size of patches increase from west to east following the increase in rainfall. The natural vegetation of the Thar Desert is composed of the following tree, shrub and herb species: The endemic floral species include "Calligonum polygonoides", "Prosopis cineraria", "Acacia nilotica", "Tamarix aphylla", "Cenchrus biflorus". The Thar Desert is the most widely populated desert in the world, with a population density of 83 people per km. In India, the inhabitants comprise Hindus, Muslims, and Sikhs. In
Thar Link Express renewable rail communication agreement was again extended by both nations from 19 January 2016 to 18 January 2019. This agreement forms the basis of running Thar Link Express, as well as the Samjhauta Express. The Delhi–Lahore Bus and Srinagar-Muzaffarabad Bus are based on a separated agreement. The Thar Link Express is a continuation of the previous "Sind Mail", when it was revived after a period of 41 years on 18 February 2006. Indian network, on which this train runs, was converted to broad gauge long ago. In 2005, Pakistan also converted the line from metre gauge to broad gauge. This