The Romford to Upminster Line or Upminster Branch Line is a branch line between Romford and Upminster in the London Borough of Havering. The line is part of the Network Rail Strategic Route 7, SRS 07.09, and is classified as a rural line. The line is single track throughout, electrified at 25 kV AC, has a loading gauge of W6, and a line speed of 30 mph.