Singapore's public transit system is run as a for profit (two competing companies, in fact), and it's one of the best and cheapest in the world.
https://www.straitstimes.com/singapore/transport/government-...
...and of course, this being Singapore, the companies in question (SMRT Corp and SBS Transit) are themselves largely owned by various government entities (Temasek etc).
Comfortdelgro is not largely owned by the Singapore sovereign wealth fund, and I personally like its lines a bit better than the smrt lines.