paragraph_text: Operating at normal power line frequencies, universal motors are often found in a range less than 1000 watts. Universal motors also formed the basis of the traditional railway traction motor in electric railways. In this application, the use of AC to power a motor originally designed to run on DC would lead to efficiency losses due to eddy current heating of their magnetic components, particularly the motor field pole-pieces that, for DC, would have used solid (un-laminated) iron and they are now rarely used.

paragraph_text: The Midland Railway's Paget locomotive, No. 2299, was an experimental steam locomotive constructed at its Derby Works in 1908 to the design of the General Superintendent Cecil Paget (though Richard Deeley was Locomotive Superintendent at the time). As the Midland shrouded the locomotive in secrecy, there is only one known photograph, which was not released until after The Grouping of 1923.

paragraph_text: LMS diesel shunter 7050 is an experimental 0-4-0 diesel-mechanical shunting locomotive, introduced by the London Midland and Scottish Railway (LMSR) in 1934 and which remained in service with that railway for six years. It was later acquired for military use and is now preserved at the National Railway Museum.

paragraph_text: The first full-scale working railway steam locomotive was built by Richard Trevithick in the United Kingdom and, on 21 February 1804, the world's first railway journey took place as Trevithick's unnamed steam locomotive hauled a train along the tramway from the Pen-y-darren ironworks, near Merthyr Tydfil to Abercynon in south Wales. The design incorporated a number of important innovations that included using high-pressure steam which reduced the weight of the engine and increased its efficiency. Trevithick visited the Newcastle area later in 1804 and the colliery railways in north-east England became the leading centre for experimentation and development of steam locomotives.

paragraph_text: The original Keadby railway station was the eastern-most terminus of the South Yorkshire Railway. The railway, which was extended from Thorne and opened in September 1859 was built without an Act of Parliament, as the railway company owned the canal alongside which they built the line.

paragraph_text: The museum was formerly the Museum of Lenin’s funeral train. It still houses exhibits relating to Vladimir Lenin's Funeral train including the 4-6-0 steam locomotive U-127 (Russian У-127) and Lenin’s funeral van No 1691. The collection of exhibits has been expanded and it now also houses many artifacts concerning the Moscow Railway and the history of Russian Railways from the beginnings of the railways in Russia to the present day. The collection includes models, displays, documents, photographs, uniforms and items of railway equipment. U-127 is the only surviving Russian locomotive class U.

paragraph_text: The GER Class 127 was a class of a solitary experimental 0-6-0 compound steam locomotive built by the Great Eastern Railway at its Stratford Works in 1888. It was rebuilt as a simple locomotive in 1895, and withdrawn in 1913.

paragraph_text: On December 30, 1922, with the creation of the Soviet Union, Russia became one of six republics within the federation of the Union of Soviet Socialist Republics. The final Soviet name for the republic, the Russian Soviet Federative Socialist Republic, was adopted in the Soviet Constitution of 1936. By that time, Soviet Russia had gained roughly the same borders of the old Tsardom of Russia before the Great Northern War of 1700.

paragraph_text: The Egyptian State Railways 545 class was a type of standard gauge mixed traffic steam locomotive on Egyptian State Railways (Egyptian Republic Railways after the Egyptian Revolution of 1952; now Egyptian National Railways).

paragraph_text: The Crimean People's Republic () () existed from December 1917 to January 1918 in the Crimean Peninsula, a territory currently disputed between the Russian Federation and Ukraine. Crimean People’s Republic was the first Turkic and Muslim democratic republic in the world. In its founding, the Crimean People's Republic was one of many short-lived attempts to create new states after the Russian Revolution of 1917 had caused the Russian Empire to collapse.

paragraph_text: The dissolution of the Soviet Union occurred on December 26, 1991, officially granting self - governing independence to the Republics of the Soviet Union. It was a result of the declaration number 142 - Н of the Supreme Soviet of the Soviet Union. The declaration acknowledged the independence of the former Soviet republics and created the Commonwealth of Independent States (CIS), although five of the signatories ratified it much later or did not do so at all. On the previous day, 25 December 1991, Soviet President Mikhail Gorbachev, the eighth and final leader of the Soviet Union, resigned, declared his office extinct, and handed over its powers -- including control of the Soviet nuclear missile launching codes -- to Russian President Boris Yeltsin. That evening at 7: 32 p.m., the Soviet flag was lowered from the Kremlin for the last time and replaced with the pre-revolutionary Russian flag.

paragraph_text: In a nationally televised speech early in the morning of December 25, 1991, Gorbachev resigned as president of the USSR – or, as he put it, "I hereby discontinue my activities at the post of President of the Union of Soviet Socialist Republics." He declared the office extinct, and all of its powers (such as control of the nuclear arsenal) were ceded to Yeltsin. A week earlier, Gorbachev had met with Yeltsin and accepted the fait accompli of the Soviet Union's dissolution. On the same day, the Supreme Soviet of the Russian SFSR adopted a statute to change Russia's legal name from "Russian Soviet Federative Socialist Republic" to "Russian Federation," showing that it was now a sovereign state.

paragraph_text: VHF Records is an American record label, known for their extensive work with several major experimental artists. The label is based in the Washington, DC suburb of Fairfax, Va., and it initially focused on indie and experimental bands from that region. The label has since branched out to release innovative and offbeat music from around the world, although Northern Virginia artists are still prominently featured in the catalog.

paragraph_text: Raisa Maximovna Gorbacheva ( "Raisa Maksimovna Gorbachyova", , Титаренко; 5 January 1932 – 20 September 1999) was a Russian activist who was the wife of Soviet leader Mikhail Gorbachev. She raised funds for the preservation of Russian cultural heritage, fostering of new talent, and treatment programs for children's blood cancer.

paragraph_text: The Russian SFSR was controlled by the Communist Party of the Soviet Union, until the abortive 1991 August coup, which prompted President Yeltsin to suspend the recently created Communist Party of the Russian Soviet Federative Socialist Republic.

paragraph_text: The Palazzo della Consulta (built 1732-1735) is a late Baroque palace in central Rome, Italy, that since 1955 houses the Constitutional Court of the Italian Republic. It sits across the Piazza del Quirinale from the official residence of the President of the Italian Republic, the Quirinal Palace.

paragraph_text: There has, however, been interest among railroad operators in returning to DC use at higher voltages than previously used. At the same voltage, DC often has less loss than AC, and for this reason high-voltage direct current is already used on some bulk power transmission lines. DC avoids the electromagnetic radiation inherent with AC, and on a railway this also reduces interference with signalling and communications and mitigates hypothetical EMF risks. DC also avoids the power factor problems of AC. Of particular interest to railroading is that DC can supply constant power with a single ungrounded wire. Constant power with AC requires three-phase transmission with at least two ungrounded wires. Another important consideration is that mains-frequency 3-phase AC must be carefully planned to avoid unbalanced phase loads. Parts of the system are supplied from different phases on the assumption that the total loads of the 3 phases will even out. At the phase break points between regions supplied from different phases, long insulated supply breaks are required to avoid them being shorted by rolling stock using more than one pantograph at a time. A few railroads have tried 3-phase but its substantial complexity has made single-phase standard practice despite the interruption in power flow that occurs twice every cycle. An experimental 6 kV DC railway was built in the Soviet Union.

paragraph_text: 1,500 V DC is used in the Netherlands, Japan, Republic Of Indonesia, Hong Kong (parts), Republic of Ireland, Australia (parts), India (around the Mumbai area alone, has been converted to 25 kV AC like the rest of India), France (also using 25 kV 50 Hz AC), New Zealand (Wellington) and the United States (Chicago area on the Metra Electric district and the South Shore Line interurban line). In Slovakia, there are two narrow-gauge lines in the High Tatras (one a cog railway). In Portugal, it is used in the Cascais Line and in Denmark on the suburban S-train system.

paragraph_text: The first electric railway in Great Britain was Volk's Electric Railway in Brighton, a pleasure railway, which opened in 1883, still functioning to this day. The London Underground began operating electric services using a fourth rail system in 1890 on the City and South London Railway, now part of the London Underground Northern line. The Liverpool Overhead Railway followed in 1893, being designed from the outset to be electric traction, unlike the City and South London Railway which was designed to be cable hauled initially. Main line electrification of some suburban lines began in the early years of the 20th century, using a variety of different systems. In 1921 a government committee chose 1,500 V DC overhead to be the national standard, but little implementation followed and many different systems co-existed. During the interwar period, the Southern Railway adopted the 660 V DC third rail system as its standard and greatly expanded this system across its network of lines south of London.

paragraph_text: The Ministry of Transport (MOT) of the Government of the People's Republic of China is an agency responsible for railway, road, air and water transportation regulations. Before March 2013, it was not in charge of the conventional railway transportation, which was administrated by the Ministry of Railways. It is a member of the State Council of the People's Republic of China.

Question: Who is the spouse of the President of the Russian Republic at the time when the place where an experimental 6kV DC railway was built disintegrated?
Answer: Raisa Maximovna Gorbacheva