 The route of the river Calder east of Healey was altered, being moved south to create more space for the new marshalling yard, the 1800s mill pond formed by the attempted re-routing of the Calder for the original Manchester and Leeds rail link was filled in, "Healey Low Mill" was demolished, the Healey Road sewage works removed, and three additional rail bridges built to carry the tracks across the Calder.By 1920 extensive railway sidings had been developed on the railway line east-southeast of Healey, named Healey Mill Sidings.In the 1960s, as part of a modernisation plan, the sidings were re-designed for more efficient wagon load handling.