The 15 in (381 mm) gauge, single track Lakeside Miniature Railway runs along the seaward side of the Marine Lake in Southport, England.

[2] The railway originally consisted of a straight running line on the seaward shore of the Southport Marine Lake with a run-round loop at each end.

In 1948 the line was extended northwards under Southport Pier, followed by a sharp 90-degree curve seawards[3] into a new terminus next to and named after Marine Parade.

In 2020 Pleasureland made significant investment in this terminus, adding a short platform on the eastern runround loop, a refreshment kiosk, a traditional roundabout and a helter-skelter, all aimed at the families with young children market.

The original station building[13] at Marine Parade was completely rebuilt around 2010 but was demolished in 2019, leaving the floor tiles in place to show it's outline.

In 1945 the railway was sold to Harry Barlow who owned a local engineering company famous for building miniature locomotives.

[23] By 2020 Jenny was showing signs of heavy use; the railway exchanged its three unserviceable, stored locomotives for a fully operational Severn Lamb "Wild West" outline Diesel-hydraulic 2-8-0.

The railway featured in scenes in the 1985 Goldcrest Films production Mr Love starring Barry Jackson and Maurice Denham.

[25] The line originally had two steam locomotives of the Bassett-Lowke Class 10 'Atlantic' 4-4-2 design, named King George and Princess Elizabeth, they were later supplemented by Katie, an 0-4-0 side tank built by that pioneer of the minimum gauge Sir Arthur Heywood.

In 1948 the railway's motive power took a step towards the future with the building of a petrol-electric loco of 4-6-2 wheel arrangement with a tender, built to look like Gresley's famous LNER Class A4 locomotives.

In 1971 another loco joined the fleet, a Severn Lamb product built to look like a Western Diesel, its wheel configuration is Co-Co with diesel-hydraulic drive.

Trains do not run to a timetable, but shuttle back and forth, generally from 11am to 5pm/6pm, though bad weather can lead to cancellation or early closure.