The much-touted Bombardier rakes that were supposed to replace the worn-out old rakes will not be able to operate as they are taller, and will pose problems once the system switches from direct current to alternating current traction.
Mumbai Railway Vikas Corporation had ordered 72 of these new-age electrical multiple units (EMUs) in 2011 at a cost of Rs 3,041 crore. Forty of them were to operate on CR's suburban system and 32 on Western Railway.
A senior CR official said, "The maximum height of the coach should be 4.27 metres for the rakes to operate on CR.
The Bombardier Transportation rakes' height is around 4.29 metres. It will not be possible to operate them on CR." The development will force CR to hand over the Bombardier rakes to WR in return for the ones from Siemens, an official said. The shells of the 72 new rakes for the city's suburban trains were to be manufactured at the Integral Coach Factory (ICF), Chennai, and the electrical fittings provided by Bombardier Transportation (BT). Prototype trials were to be completed by May this year, but have now run into the fresh hurdle.
CR will switch from 1,500V DC current to 25KV alternating current. The higher the height of the rake, the closer it will bring the overhead equipment (OHE) wires to the surface of the bridges when it comes in contact with the train's pantograph.
A CR official said, "We cannot lower the tracks nor can we raise the height of bridges.The only option is to run the Siemens rakes."
A senior railway official blamed the problem on "ineffi ciency", saying, "Either MRVC or Research, Design & Standards Organisation (RDSO) should have ensured the BT rakes do not exceed the height of the Siemens ones."
CR operates suburban services with 51 Siemens rakes, nine BHEL, two retrofitted rakes and 12 direct current (DC) compatible rakes.
A CR official said, "We will have to hand over the BT rakes to WR, in exchange for Siemens ones. The BT rakes have not been approved by the commissioner of railway safety almost 14 months after two prototypes came here." He said, "If there is a further delay, it can create problems for smooth running of trains, as most of our rakes are old and will have to be phased out soon."
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