The 170,000 commuters who travel to work on Brisbane trains each day will find out this afternoon if there'll a 24-hour strike next week.

The issue will be determined by another round of crisis talks between unions and Queensland Rail.

The Rail Tram and Bus Union (RTBU) says the main issue which has to be settled is QR's demand for train drivers to work 26 Sundays per year - one in two Sundays, instead of one in three.