much-awaited WAG-12 locomotive has been commissioned into revenue service by the Indian Railways. A long-haul train was worked by this locomotive in Mughalsarai division. The locomotive has been allocated a block of road numbers starting from 60000 onwards.
Based on the Prima Kz8A platform, the Alstom manufactured locomotive is primarily meant for service on the Eastern Dedicated Freight Corridor (EDFC). However, with the DFC not commissioned fully yet, the WAG-12 will operate on the IR network.
WAG-12 has two variants; The first model was the WAG-12A, of which only one unit has been manufactured. This design experienced issues with ride quality, which resulted in major modifications to the suspension and the bogies.
The final design, now known as WAG-12B, has been approved by the Indian Railways. This design is now heading for serial production at the new factory set up at Madhepura in Bihar.
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⏩ Technical Specifications of the WAG-12B
🔹️ Axial Arrangement :- Bo-Bo (For each of two units)
🔹️ Number of Axles :- 8
🔹️ Mass of Locomotive :- 180 Tons [Upgradeable to 200 Tons]
🔹️ Length :- 19,200 mm per unit ; 38,400 mm total length
🔹️ Centre-To-Centre Distance Between Bogies :- 10,200 mm
🔹️ Maximum Speed :- 100 km/h [Upgradeable to 120 km/h]
🔹️ Continuous Speed :- 60 km/h
🔹️ Max Load Haulage :- 6,300 tons, 1:150 Gradient, 60 kph for 25 Ton Per Axle Variant
🔹️ OHE Voltage :- Nominal: 22.5 kV, 50 Hz
Maximum: 31 kV
Minimum: 17 kV
🔹️ Traction Power (Continuous Rating) :- 9,000 kW (12,069 hp approx)
🔹️bMax Starting TE at 25t Axle Load / 22.5t Axle Load :- 785 kN / 705 kN
🔹️ Braking Effort :- 563 kN
🔹️Max Braking Effort :- 79.315 kN per motor
🔹️ Stopping Distance :- 900 metres: 100 kph to 0 kph
🔹️ Remote Multiple Unit Operations :- Yes, 2 Locomotives
🔹️ Traction Motor :- Asynchronous, Nose Suspended
🔹️ Maximum RPM :- 2,711
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⏩ New Features on the WAG-12
1️⃣ Two units (A and B) permanently coupled to each other. Both units only have cabs on the outward-facing ends.
2️⃣ Both units will be controlled from the working cab.
3️⃣ While both units will be provided with one pantograph each. However, only one pantograph will be raised at a time and will feed power to both the units through a high-tension overhead link.
4️⃣ Both units have been provided with a toilet for the crew.
5️⃣ The units are connected to each other through a vestibule and gangway.
6️⃣ A major departure from existing designs of locomotives is that high voltage apparatus like the vacuum circuit breaker is now inside the body of the locomotive in a special cubicle. The roof of the locomotive is almost empty except for the pantograph.
7️⃣ This locomotive has a larger wheel diameter, compared to other freight locomotives in service on the IR.
8️⃣ This locomotive also features the much-awaited ‘Brake Blending’ facility. If regenerative braking (AKA electric or Electro-Dynamic brake) is applied and found insufficient, a proportionate quantum of the pneumatic brake is applied simultaneously by the locomotive.
9️⃣ To improve reliability, almost all hardware switches and controls are replicated on the DDU (Driver Display Unit). Thus, several functions can also be controlled using ‘Soft Keys’.
🔟 A dehumidifier for air intake ensures that only dry air is used for cooling and ventilation systems. This will improve equipment life and insulation.
1️⃣1️⃣ An automatic flap system regulates the entry of air into the locomotive’s ventilation system and ensures uniform flow in various conditions.
1️⃣2️⃣ Tube drive equipped with self-aligning roller bearings for better suspension.
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⏩ Differences Between WAG-12A and WAG-12B
Limitations of the original WAG-12 design resulted in modifications and the WAG-12B variant. Here are the key differences between both types.
(WAG 12 / WAG 12 B)
1️⃣ Total Length :- 35,000 mm / 38,400 mm
2️⃣ Bogie Design :- Flat solebar / Gooseneck or handlebar shaped solebar
3️⃣ Traction link coupling between the bogie and body :- Below the driving cab / Turned around and now provided in the middle of the body
4️⃣ Center to center distance between the bogies :- Lower (8,500 mm) / Higher (10,200 mm)
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