Sydney Trains boss Howard Collins was "lambasted" by hundreds of union delegates after spending two hours presenting them an unchanged offer on Thursday.

The package was the same as that put forward last week and rejected via a controversial text message poll of union members.

Workers then planned a 24-hour strike that was subsequently suspended by the Fair Work Commission.

The offer includes a 2.75 per cent a year pay rise, free bus travel and a one-off $1000 payment.

Rail, Tram and Bus Union NSW secretary Alex Claassens says delegates went into Thursday's meeting expecting a better deal and left frustrated.

"The delegates in that room loudly and clearly told Howard Collins that offer is nowhere near enough, go away and come back with a better one," the union boss told reporters in Sydney.

"It's almost as if nobody's listened to what we've been saying."

Mr Claassens said the documents presented didn't match agreements reached during negotiations. He blamed - in part - the state's Transport Minister Andrew Constance.

The NSW secretary also acknowledged the union had lost a big bargaining chip after the Fair Work Commission ordered their planned industrial action be suspended for six weeks.

"Our right to strike has been taken away from us," he said.

"It's just a simple matter of the minister giving his blessing and saying to the management team 'go and do what you need to do guys''".

Rostering and pay are two key issues in dispute that weren't discussed at the union delegates meeting on Thursday, Mr Claassens said.