The WDG-4G (Wide/broad Gauge Diesel Goods/freight, Class 4G) is a class of 4,500 HP Diesel-electric freight locomotive developed by GE Transportation based on its existing Evolution Series of locomotives for Indian Railways. The locomotives will be manufactured in a newly constructed factory(Diesel Locomotive Factory, Marhowra) in Bihar. They will be used exclusively for freight hauling and will replace the existing fleet of old Alco locomotives. They will also feature the most fuel efficient diesel engine(GEVO) used till now by Indian Railways. For driver's comfort,cabs will have air conditioning and toilets. The development of WDG-4G loco can be traced back to September 2013, when the Ministry of Railways had received bids from six global firms: Siemens, Alstom, Bombardier, General Electric, CSR Corp and CNR Corp.[6] However, Indian Railways rejected the bid of both Chinese firms (CSR and CNR) for the two giant manufacturing projects in Bihar. In January 2014, the Union Cabinet gave its approval for setting up Electric Locomotive Factory in Madhepura and Diesel Locomotive Factory (DLF) in Marhowra at an approximate cost of ₹1,293.57 crore (US$180 million) and ₹2,052.58 crore (US$290 million) respectively. On 9 November 2015, the Ministry of Railways awarded the contracts for Madhepura project and Marhowra project to Alstom and General Electric respectively in a collective amount of US $6 billion. This multi crore rupees deal was seen as the country's first FDI in the railway sector.[9] After winning the contract, General Electric started the designing of locomotives.They were designed by the Indian branch of GE Global Research in Bangalore.Both the locomotives are based on GE’s Evolution-series locomotives, which are one of the most fuel efficient and least emissions making locomotives in the world.To meet specific local requirements, the locomotive had to weigh only 22 tons per axle, while its American counterparts typically weigh 25 to 30 tons.GE faced a challenge to take out as much as 48 tons from the whole locomotive. The first locomotive rolled out GE's Erie plant on 3 August 2017 with the orange and yellow paint livery. General Electric’s first diesel locomotive arrived in India on October 11, 2017 from the US. What is Dwarf : Indian Railways Introduces First Double Stack Dwarf Container Service from Rajkot Division, Western Railway. Indian Railways has received increased revenue of Rs. 18.50 lakhs by operation of Double Stack Dwarf Container Service. These short-heighted Double Containers can run on most tracks over Indian Railways. With the use of these double-stack dwarf containers, the cost of the unit will be significantly reduced due to the rail transport being cheaper than the road. Under the guidance of Shri Piyush Goyal, Minister of Finance, Corporate Affairs, Railways and Coal, in order to capture the lost traffic through new delivery model for domestic cargo, Indian Railways has introduced Double Stack Dwarf Container Services. This freight train was flagged off on 7th July, 2018 from Western Railway’s Rajkot railway station on its maiden commercial run. This train was booked from the Reliance Rail Siding at Kanalus to Rewari in the state of Haryana; it was loaded with 82 containers Polypropylene Granules. Due to this Double Stacked Dwarf Container service, Indian Railways has received increased revenue of Rs. 18.50 lakhs. The Double Stacked Container is 6 ft 4 inches in height and can run on electrified tracks. Despite being smaller in size, the dwarf containers can hold a capacity of 30,500 kgs. In comparison with regular containers, these containers are 662 mm short but 162 mm wider. The dwarf containers can hold a volume of approximately 67% more when compared to traditional containers. Presently, due to its height, the regular double stack ISO containers can run only on few chosen routes on Indian Railways but these short-heighted Double Containers can run on most tracks very easily. These containers in double stack formation can run under 25kV overhead lines. With the use of these double-stack dwarf containers, the cost of the unit will be significantly reduced due to the rail transport being cheaper than the road.