Prior to The First World War the Locomotives in India were chiefly build to the British Engineering Standard Association (BESA) standards. Post war there was a need to upgrade the existing designs to develop more powerful locomotives that were also suite to burn inferior grade coal. A Locomotive standard committee was set up in 1924, which in consultation with BESA and other Railways initially developed 3 passenger and 2 goods locomotives, besides shunting locos. This class of locomotives was manufactured after 1927 and came to be known as Indian Railway Standard (IRS) class of locomotives. These locos were coded as 'X' for broad gauge and named as XA, XB, XC, XD.

The XE 3634 available at Rewari Steam Loco shed is of 1930 vintage, this locomotive was owned and operated by the Madhya Pradesh Electricity Board, in their Thermal Power Plant at Kobra, The loco was gifted to the Railways after it was decommissioned. It is the only surviving IRS class locomotive in India which is on steam. The Loco is named “ANGADH”, after the legendary mythological figure whose foot once planted firmly, could not be lifted by anyone. Enjoy the beauty of this majestic, vintage locomotive while at Rewari Steam Loco shed.