The Parnell Tunnel is a railway tunnel under Parnell, Auckland, New Zealand. It is 344.5 metres (1,130 ft) long, and is on the Newmarket Line. The tunnel allows the Western, Southern and Onehunga lines coming from the Newmarket Train Station to Britomart Transport Centre to pass under the Parnell Ridge before dropping to harbour level. There are two Parnell Tunnels, an older now unused single-track tunnel and a newer double-track tunnel which superseded it. The older tunnel was closed off and has not been in use for most of the last century.