Local demolition contractor Coleman started the process of removing around 20,000 tonnes of concrete and dismantling the roof on the top of the existing station building a few weeks ago.
This will create the huge space to form a new atrium, which will be as high as eight double decker buses and form the centrepiece of the new station.
Construction of the steelwork, which will form the atrium roof will start later this year.
Interested steelwork contractors will need to turnover more than £15m a year to prequalify for the job, which includes primary and secondary steel frame, metal decking, steel staircases and interfacing with other works package contractors.
Network Rail has also stipulated that it is not interested in bids from main contractors aiming to subcontract the steelwork.
The winning contractor will be responsible for the design, including steelwork to concrete connections, metal decking, stairs, intumescent fire protection and relevant temporary works.
Further details are available by email from Tim.Jakeman@networkrail.co.uk