The clearest view yet of how HS2 would transform Birmingham’s Eastside has been revealed.

New images released by HS2 of the huge Curzon Street station – including its wave-like roof stretching more than a quarter of a mile – show how a corner of the city will be drastically transformed.

Architect Glenn Howells, who has drawn up plans to regenerate the city’s Eastside, and is an advocate of HS2, said the new images were an encouraging step forward.

He said: “The images show the character of the area and the challenges from the changes in levels.

“They are encouraging, as they put into context how it is all going to work.”

If HS2 goes ahead Curzon Street station will become one of the biggest buildings in the city centre, with an enormous glass frontage.

It will stretch from Millennium Point to the existing Moor Street station opposite the Bullring shopping centre. There will be seven platforms 1,300ft long – six for domestic train services with the seventh capable for international services to European cities.

The lower eastern entrance will be at ground level from New Canal Street and Curzon Street.

The upper concourse western entrance of the station will join onto Moor Street Queensway at ground level, with a connection to Moor Street station.

The proposals will also provide a new future for the surviving Grade I-listed entrance to the old Curzon Street station, which was built in 1838.