A report into the future of HS2 is being delayed until after the election.
The panel looking at the high-speed rail project were stood down on October 31 and its deputy chairman Lord Tony Berkeley has warned it may stay under wraps for some time yet.
Former HS2 chairman Doug Oakervee was appointed by Prime Minister Boris Johnson earlier this year to look into the options for the new high-speed rail line including whether the project should go ahead at all.
Andy Street, West Midlands Mayor and a huge supporter of HS2, was also a member of the panel working on the review.
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Lord Berkeley tweeted at the weekend: "My role as dep chair of the Oakervee Report on HS2 finished yesterday. Report not finished and no opportunity to influence conclusions.
"We are told that, when completed by Doug O and the DfT secretariat, it will be locked into the DfT vaults for the new S of S (transport secretary) to publish."
A spokesperson for the Department for Transport said: "We thank Lord Berkeley for his work.
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"The Oakervee review will conclude in the autumn and it would be inappropriate to pre-empt its recommendations."
The news prompted an angry reaction from Birmingham MP Liam Byrne who said any stalling of the project would delay bringing new jobs and investment into Birmingham.
Mr Byrne will be a Labour candidate in the General Election on December 12 and is also hoping to be chosen as Labour's candidate in the 2020 West Midlands Mayoral election.
He said: "The battering of Birmingham continues unabated.
"Every day's delay is a day we delay new jobs, new business rates and new opportunities for Birmingham residents.
"Frankly, Boris' carefree attitude to Birmingham's future tells you everything you need to know about how he cares about Britain's second city."
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Parliament goes into Purdah on November 6 after which no major announcements can be made until after the new government is installed following the election.
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In September, Transport Secretary Grant Shapps said: "The review will report to me this autumn.
"I will discuss its findings with the Prime Minister and Chancellor of the Exchequer. Its recommendations will inform our decisions on our next steps."
Earlier this year, the Department for Transport confirmed the proposed rail network would cost up to £22 billion more than originally forecast.
Completion of the first phase, between London and Birmingham, will also be delayed by up to five years until 2031 and the second phase, serving the North West, East Midlands and Yorkshire, will complete as late as 2040.
It was initially due to be ready for passengers in 2033.