HSM28A Winterbottom to Rostherne

The route between Winterbottom and Ardwick would be 26.8km long. The section of route connecting to Winterbottom from the south would be HSM10 from Hough. The design speed is 400kph (248mph) south of the grade separated junction and 230kph (142mph) through the junction and on the spur towards Ardwick.

The route would be on an embankment with a maximum height of 8m for 1km before the junction, where the route would pass through the route of overhead power lines. A grade separated junction would be provided on the through route (HSM12) with the two lines splitting to four 500m south of Hoogreen Lane. The outer two lines would form the diverging spur towards Manchester Piccadilly. Hoogreen Lane would be realigned onto a bridge over the route. The A50 would be realigned onto a bridge over all four lines. The western diverging line would rise to cross over the through route joining the eastern line on an embankment with a maximum height of 5m, again passing through the route of overhead power lines. Peacock Lane would be realigned onto a bridge over the route

The route would then pass into cutting with a maximum depth of 8m, cross the Agden Brook flood plain on a 45m long viaduct (height 6m) and enter a further length of cutting up to 9m deep, passing under Millington Lane. After 400m at ground level the route would pass under the A556 and run between Rostherne Mere and the M56 in a cutting up to 11m deep. It will be necessary to prevent groundwater flows into the deep cutting and possibly to seal the cutting and provide a permeable flow route. Tom Lane would cross over the route on a bridge.

Blackburn’s Brook would be crossed on a 75m long viaduct which would pass through the route overhead power lines. Birkin Brook would be crossed on a 135m long viaduct at a height of 4m. A short length of cutting (maximum depth 4m) follows with the route then rising onto an embankment (height up to 8m).

Information taken from HS2 Phase two engineering options report West Midlands to Manchester part 1

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