Former Transport Secretary Lord Adonis has warned HS2 may not happen by the 2020s due to "endless dither and delay" by the Government.
He said plans to get HS2 on the statue book by the end of this parliament could be slowed by dispute between coalition parties ahead of the next general election.
The £33 billion project was given the go ahead in January, with the London to Birmingham line expected to be opened by 2026.
The business community in Nottingham have been weighing up the pros and cons of having an elected mayor to run the city. Members of the Derbyshire and Nottinghamshire Chamber of Commerce (DNCC) questioned politicians about the idea.
Nottingham is one of ten English cities considering whether to move to a mayoral-style of local government. The issue will be put to voters in a referendum on May 3rd.