Haydock railway station served the village of Haydock, formerly in Lancashire, now in Merseyside, England. The station was on the Liverpool, St Helens and South Lancashire Railway line from Lowton St Mary's to the original St Helens Central railway station where it was crossed by what is now the A599 in the centre of the village. East of the station was the 99 yards (91 m) Haydock Colliery Tunnel, the only tunnel on the line. It was built at the railway's expense using the 'cut and cover' method. Its sole purpose was to burrow beneath Haydock Colliery's tracks.