(1) The Cross City Line which runs on a north-south axis with a passenger station at Duddeston.

(2) The Birmingham-Peterborough Line which runs on a north-south axis roughly parallel to the Birmingham and Warwick Junction Branch Canal and around 350 metres east of the Cross City Line.

(3) The Stechford Avoiding Line which runs on an east-west axis, bridges the Birmingham-Peterborough Line and joins the Cross City Line at Aston Junction South.

Heading north-east from Curzon Junction, the line runs on a grade-II-listed 28-arch viaduct bridging St James Place, Northumberland Street and Erskine Street.

From Erskine Street, it enters a cutting, running between Nechells Green Housing Estate and an industrial park before arriving at Duddeston Station beneath Duddeston Mill Road.

Heading north from Duddeston Mill Road, the line climbs an embankment between Nechells Green and Saltley before bridging Saltley Road and passing the Bloomsbury Housing Estate.

From the Bloomsbury Estate, it runs in a cutting beneath Nechells Place and Nechells Park Road, passing the Wing Zip Superstore, Nechells Bathhouse and Long Acre Industrial Estate.

Heading north from Long Acre, it runs above Hockley Brook and the Birmingham and Fazeley Canal before reaching Aston Junction South and Aston Station.

Heading north from Proof House Junction, the line travels through a belt of industrial estates and on an embankment above Duddeston Mill Road, roughly parallel to the Birmingham and Warwick Junction Branch Canal, before entering a cutting beneath Saltley Viaduct.

Heading west from Heartlands Parkway, the line bridges the Birmingham and Warwick Junction Branch Canal.

It then enters a cutting, broadly parallel to Aston Church Road and Holborn Hill, and travels beneath Nechells Park Road, Cook Street and Long Acre before arriving at Aston Junction South.