 Part of the structure included a long timber viaduct with 502 openings near Yarra Glen, spanning the Yarra River and the adjacent flood plains.The extension of the line from Yarra Glen to Healesville required a 1 in 40 (2.5%) climb into a 154.4 metre tunnel with a corresponding descent at nearly the same grade.The Healesville Station opened on 1 March 1889 with an intermediate station at Tarrawarra.