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[IRI] देसी बुलेट | Indian Bullet | Ayrodynamic DEMU meet Kranataka Sampark Kranti in Hyderabad

1,224 views · Published 20 October 2018 · 1:35 · Indexed 14 November 2026

Channel: Mohd Arif · 2018 · Travel & Events

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Right on time #Desi #Bullet  77605 Falaknuma - Bolarum Local(  ఫలక్‌నుమ - బొలారం లోకల్(డేము) /  फलकनुमा - बोलारम लोकल (डेमू) ) Meets 12649 Karnataka Sampark Kranti Express  in Hyderabad 

Few Info About #DEMU Trains :- 

   A diesel multiple unit or DMU is a multiple-unit train powered by on-board diesel engines. A DMU requires no separate locomotive, as the engines are incorporated into one or more of the carriages. Diesel-powered single-unit railcars are also generally classed as DMUs. Diesel-powered units may be further classified by their transmission type: diesel–electric (DEMU), diesel–mechanical (DMMU) or diesel–hydraulic (DHMU). 
The diesel engine may be located above the frame in an engine bay or under the floor. Driving controls can be at both ends, on one end, or in a separate car.  DMUs are usually classified by the method of transmitting motive power to their wheels
In a diesel–electric multiple unit (DEMU), a diesel engine drives an electrical generator or an alternator which produces electrical energy. The generated current is then fed to electric traction motors on the wheels or bogies in the same way as a conventional diesel–electric locomotive. 
  In modern DEMUs, such as the Bombardier Voyager family, each car is entirely self-contained and has its own engine, generator and electric motors.  In older designs, such as the British Rail Class 207, some cars within the consist may be entirely unpowered or only feature electric motors, obtaining electric current from other cars in the consist which have a generator and engine. 
A train composed of DMU cars scales well, as it allows extra passenger capacity to be added at the same time as motive power. It also permits passenger capacity to be matched to demand, and for trains to be split and joined en route. It is not necessary to match the power available to the size and weight of the train, as each unit is capable of moving itself. As units are added, the power available to move the train increases by the necessary amount. DMUs may have better acceleration capabilities, with more power-driven axles, making them more suitable for routes with frequent closely spaced stops, as compared with conventional locomotive and unpowered carriage setups.
  Distribution of the propulsion among the cars also results in a system that is less vulnerable to single-point-of-failure outages. Many classes of DMU are capable of operating with faulty units still in the consist. Because of the self-contained nature of diesel engines, there is no need to run overhead electric lines or electrified track, which can result in lower system construction costs.
  Such advantages must be weighed against the underfloor noise and vibration that may be an issue with this type of train.
 Generally diesel traction has several downsides compared to electric traction, namely higher fuel costs, more noise and exhaust as well as worse acceleration and top speed performance. The power to weight ratio also tends to be worse.
  DMUs have further disadvantages compared to diesel locomotives in that they cannot be swapped out when passing onto an electrified line, necessitating either passengers to change trains or Diesel operation on electrified lines. Similarly the lost investment once electrification reduces the demand for diesel rolling stock is higher than with locomotive hauled trains where only the locomotive has to be replaced. 

    DMUs (DEMUs) are widely used in India. DEMU"s in India are used in both the 8 coach format and the 4 coach format.
  First generation DMU: Rated power was 700 HP and had 3 or 6 coaches, made first by ICF. Transmission was Voith-hydraulic. Max speed 100 kmph.   
  Second generation DMU: Rated power was 1400 HP and have 8 coaches. Max speed is 105 kmph. Transmission is DC electric. Made at HCF and RCF.
1400 HP AC-DC DEMU
   Third generation DMU: Rated power is 1600 HP and have 10 coaches. Max speed is 110 kmph. Transmission is AC electric. Made at ICF

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