Responding to the criticism of the remote Newtyle station, two further railways were built; these were nominally independent but for practical purposes were branches of the Dundee line. The lines were the "Newtyle and Coupar Angus Railway" and the "Newtyle and Glammiss Railway"; they opened in 1837 - 1838. The extension lines did not transform the finances of the main railway, but when the Scottish Midland Junction Railway wanted to build a main line between Perth and Forfar, it adopted the lines and upgrading them, incorporating them in to the route of the new main line.