was restored by Loco Works Perambur for running in 2011, making it a contender as the world's oldest operating steam locomotive. Express EIR 21 is currently running in different divisions of Southern Railway on weekends. Specifications The Fairy Queen was built by Kitson, Thompson and Hewitson at Leeds in England in 1855. The coal-fired engine is powered by two outside cylinders measuring , and has a power output of , producing a maximum speed of . It carries of water in an underslung water tank. The locomotive weighs , and the coal tender . Built for the broad gauge, it has a 2-2-2 wheel arrangement, developed by Robert Stephenson and Company in 1833, with a driving wheel measuring in diameter. Restoration The Indian government bestowed heritage status on the Fairy Queen in 1972, rendering it a national treasure. It was restored and given a special spot in the newly built National Rail Museum at Chanakyapuri, in New Delhi, which offers a comprehensive history of the Indian railway's defunct and operational models, their signalling apparatus, antique furnitures used, historic photographs, relevant literature, etc. Following the success of the Palace on Wheels, the locomotive was restored to full working order in 1997, in preparation for its first mainline journey in 88 years and its return to commercial service on 18 July. The two-day excursion saw the train plying the from New Delhi to Alwar in Rajasthan, with passengers spending an overnight stay at the Sariska Tiger Reserve. The locomotive hauled a carriage capable of carrying 60 passengers at a maximum speed of , with a service car holding a generator, compressor and pantry. The operation was repeated between December and February in the following years. It was certified by the Guinness Book of Records in 1998 as the world's oldest steam locomotive in regular operation. The following year, the train received a National Tourism Award for the most innovative and unique tourism project from Atal Bihari Vajpayee, the then Prime Minister of India. In 2011, it was discovered that rare locomotive parts that were "as good as irreplaceable" had been stolen, and the locomotive was moved to Perambur Loco Workshop at Chennai, in Tamil Nadu, for repair. On arrival, it was found that an estimated 50 to 60 parts had been looted, including "the boiler, condensor, lubricator and flow tubes". The Deputy Chief Mechanical Engineer at the workshops stated "What we received