The tender invite signals growing confidence about the future of the London scheme within the Crossrail project team.
Yesterday bids were invited for the technically-demanding Connaught Tunnel refurbisment under the Royal Docks in London.
The latest job involves building a new three-storey substation and construction of a 4m diameter, 56m long cable tunnel running beneath the London Underground Circle Line.
The new ticket hall will be constructed partly within an old London Underground ticket hall.
This area is currently used as an electricity substation, beneath the pavement south of 100 Liverpool Street between Blomfield Street and Old Broad Street.
This electricity substation will be relocated to the south of the Circle and Metropolitan lines.
The work site to relocate the electricity substation will be positioned in a cul-de-sac. Work on this aspect is expected to take five years with up to six lorry movements per day.
London Underground will take the opportunity to refurbish the existing underground ticket hall, increasing ticket gate capacity from 16 to 24. This work will be carried out at night.
Contractors have until 14 July to express an interest.
Broadgate ticket hall plan