Transport Advisor in Niti Ayog, Manoj Singh said the track record of Railways has "not been very impressive" and multiple-gauging of 12,000 kms of corridor will be challenging.
"12,000 kms of doubling in the next five years is very aggressive. They have not done it before. Railways has done only 3,500 kms in the past five years. So, against their historical record, it is aggressive. Also, in the sense of huge projects that they still have to complete," he said.
He said there are more than 300 projects that are pending with the Railways due to various reasons.
"Many projects have lacked behind schedule due to lack of resources. More than 300 projects including that of new line, doubling and gauge converging are pending," he said.
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Finding sufficient resources for projects and their timely execution are the two key challenges the railways has to deal with, he said.
"The resource requirement is mammoth. Around (Rs) 3 lakh crore is required for the pending projects. Another (Rs) one lakh crore is needed for the capacity expansion by doubling the corridors. So, total (Rs) four lakh crore is required, though Railway is confident of mobilizing it, "Singh said.
"There are a large number of Railway engineers working on major projects like the Konkan project, metro and the dedicated freight corridors. It has the technical expertise to deliver," he said.