Turnout speeds only apply to the diverging track. The default limit is 25km/h in NSW.
The old signs are angled with a chevron shape. Available limits are:
• General Speed (the default limit)
• Multi-UnitSpeed (for EMU pasenger trains)
• XPT Speed (for high speed trains)
You can adjust the sign's appearence and speed settings via the properties window.
When multiple speeds are active, train priority is used to control which speed applies to which train.