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What does ‘microprocessor control’ for a locomotive mean?

20-06-2019

'Microprocessor control' can mean a few different things. A few of the newer electric locomotive models such as the WAP-5 or WAG-9 with complex 3-phase AC drives have circuitry and equipment controlled by microprocessors. In these, the microprocessor or computerized control is an integral part of the locomotives' design. Some of the newer diesel locos such as the WDG-4, WDP-4, WDM-3D, etc., also use a fair bit of microprocessor control for their onboard systems. These advanced locomotives can be truly described as being computer-controlled or microprocessor-controlled. ये भी पढ़े - अफगानिस्‍तान में कमजोर पड़ता

How are DC locos swapped for AC locos at the point where traction power changes from DC to AC?

July 16, 2019

Today while the the Mumbai area is still mostly at 1.5kV DC, there are a couple of important AC-DC transition points such as Igatpuri -- now Kasara -- and Virar. In time, when 25kV AC becomes the norm and DC traction is decommissioned, these transitions will be history and there will be no more traction changeovers! Sad for railfans, but perhaps

Why is the neutral section provided with a dummy (neutral or electrically dead) cable? Why can’t it be a real gap?

July 16, 2019

Pantographs of electric locomotives have a spring mechanism or compressed-air assembly that keeps the pantograph pushing up against the contact wire with a certain specific pressure. If the neutral section were not wired and the contact wire simply ceased to exist, then then possibility exists that if the driver has not dropped the pantographs at

How are phase breaks (AC) or power gaps (DC) handled by the locomotives?

July 16, 2019

The catenary has breaks or gaps in its electrical continuity every once in a while at points where successive sections are connected to different substations. A neutral section of catenary is usually provided between the two live sections of different phases or connected to different substations. At such points, single locomotives do not drop

How do the new 3-phase AC locos (WAP-5, etc.) work, and how do they compare with the earlier locos?

July 16, 2019

Three-phase AC locos such as WAP-5 use some fairly new technology as compared to the earlier generations of diesel-electrics and electrics. In most of the earlier locos, the traction motors driving the axles are DC motors. DC motors were used because they afforded (in those days) far superior speed and torque control compared to AC motors — the

What’s the history of electric traction in India?

July 16, 2019

The first electric train ran between Bombay's Victoria Terminus and Kurla along the Harbour Line of CR, on February 3, 1925, a distance of 9.5 miles. In 1926, Thana and Mahim were connected. In 1927, electrification was complete up to Kalyan. In 1928, Borivili in the north was connected (Colaba-Borivili of WR being inaugurated on May 1). In 1929,

Freight stock often has the words “Not to be loose shunted” –– what does this mean?

July 16, 2019

In marshalling yards and elsewhere, a common technique of moving a wagon around is "loose shunting", where the wagon to be moved is not coupled to the shunting loco, and simply pushed to the correct location. Usually, a rake that is being built up is on one of several sidings branching off from a section of track where the shunting loco is

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What does ‘microprocessor control’ for a locomotive mean?

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