Moolabin is narrow gauge. Standard gauge goes to Acacia Ridge and Port of Brisbane.
In the greater SEQ area there are triangles at Bethania, Thorneside, Shorncliffe, Landsborough, Yandina, Gympie North and Granchester. Plus the triangular junctions at Yeerongpilly, Dutton Park - Park Road - Buranda, Sherwood - Corinda - Tennyson line, west end of Roma Street and Bowen Hills, There are also turntables at Caboolture, Moolabin, Redbank Workshops and Ipswich, and balloon loops at Mayne, Pinkenbah and Port of Brisbane.
Cheers
David