The team that proudly brought the Scottish Junior Cup to Rutherglen for the first time by beating Maryhill 1–0 at Meadowside is considered one of the greatest ever, including future Scotland senior international forwards Jimmy McMenemy and Alec Bennett, both natives of the town.

Glencairn's third Scottish Junior Cup win was in season 1926–27 and the satisfaction was all the greater because it was Cambuslang Rangers, their great local rivals, who were defeated 2–1.

In 2020, the club confirmed their intention to leave the separate Junior setup and join a proposed feeder division for the Lowland Football League, part of the pyramid system below the professional level of the Scottish game.

[4] The current Glencairn crest is heavily influenced from the town of Rutherglen's official blazon and consists of the club's initials with a football centrepiece watched over by guardian angels at each side.

[6] Although the changing facilities are modern, other things would need improvement to meet Scottish Football League regulations.

Note: Flags indicate national team as defined under FIFA eligibility rules; some limited exceptions apply.

Managers Andy McFadyen and Alex McArthur, as well as coach George Fortheringham, led the 21s to winning the treble, a historic moment for the club.

An unforgettable night at Glencairn's home pitch saw a Rutherglen last minute equaliser against Knightswood in the final game of the season clinch the West of Scotland Premier League for the first time in the club's history.