The train network went into meltdown on Tuesday afternoon as commuters at Sydney Airport were turned away from platforms, while others were left waiting more than two hours as mass-cancellations caused a major backlog around the city.
Meanwhile, Opposition Leader Luke Foley said the Berejiklian Government needed to "immediately" refund train passengers for Monday and Tuesday's travel fares.
'The government has to invest in public services.
Already on Wednesday morning, a number of services have been cancelled, particularly on the T1 Northern Line. "We know that numbers of customers using our networks are down, so we're adjusting our services accordingly".
"They've had to go out, we've have had to pull trains out of mothballs, there's no spare trains in the system and there's no spare drivers and guards so of course it's going to be a problem when people get exhausted, rushed and worn out".
A stream of complaints from frustrated train users were seen on Twitter under the hashtag #traindelay.
The new timetable introduced at the end of November has been blamed for limiting the ability of Sydney Trains to react to problems. Is that what this is?
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But the breakdown in the network - and the attribution of blame to the what Sydney Trains said was between 65 and 70 staff off due to illness - has been slammed by Labor and the unions.
Sydney train lines have been hit with track work and extreme staff shortages which created chaos across every single line in the state.
'Our train driver said our train this morning was delayed "due to people getting on and off" I wonder what Sydney Trains expect to do with trains??!' said one perplexed passenger on Tuesday.
On Wednesday morning, eight services were cancelled on three lines due to "staff availability issues" or as a result of trains not being at their scheduled locations on the network due to the earlier delays.
Minister Constance said he had asked Sydney Trains bosses Howard Collins and Rodd Staples to report to him in the next fortnight on the delays.
There were 18 train cancellations across the city on Monday because of staff calling in sick and lack of staff to cover the shifts.