Metro Rail News Online

In recent years the importance of environmental problems has increased. Because of this electrical traction has replaced the internal combustion engine for mass transit systems. At first DC locomotives were used but they have many drawbacks, such as commutation, sparks on the brushes and difficulty in maintenance. However dc motors have now been replaced by 3-phase squirrel cage induction motors. To allow speed control the dc bus bar is available (+750Vdc) with a digital inverter built into the train. Pulse width modulation (PWM) is commonly used to convert a dc voltage to three symmetrical ac components. Moreover the GTO thyristors is changed to an Insulated Gate Bipolar Transistor (IGBT Technology) for its many advantages. Most metro systems in the world now use this approach. In this paper the mathematical modelling and simulation results are presented and commented on. Introduction The population of big cities needs major projects to solve their transportation problems.  The pr...

A lstom announced the completion of its first all-electric locomotive from its state-of-the-art locomotive facility at Madhepura in the State of Bihar, on schedule. In line with the Government’s and Indian Railways’ target towards 100% electrification and towards sustainable mobility, these new locomotives will not only bring down operating costs for the Railways but will significantly cut down greenhouse gas emissions as well. This first locomotive is part of a €3.5 billion order comprising 800 electric double-section locomotives signed in 2015 which contributes to the Ministry of Railways’ public-private partnership programme to modernise the country’s rail infrastructure. This agreement remains the largest Foreign Direct Investment in the railways sector to date and has a strategic role in creating a multiplier effect on the economy. This contract is also one of the biggest contracts in the history of Alstom. “Our operations in India are paramoun...

A lstom announced the completion of its first all-electric locomotive from its state-of-the-art locomotive facility at Madhepura in the State of Bihar, on schedule. In line with the Government’s and Indian Railways’ target towards 100% electrification and towards sustainable mobility, these new locomotives will not only bring down operating costs for the Railways but will significantly cut down greenhouse gas emissions as well. This first locomotive is part of a €3.5 billion order comprising 800 electric double-section locomotives signed in 2015 which contributes to the Ministry of Railways’ public-private partnership programme to modernise the country’s rail infrastructure. This agreement remains the largest Foreign Direct Investment in the railways sector to date and has a strategic role in creating a multiplier effect on the economy. This contract is also one of the biggest contracts in the history of Alstom. “Our operations in India are paramoun...