Sydney's New Metro Train Breaks Down On 'Historic' First Day

Overcrowding and an issue with a train door have marred the long-awaited first day of the Sydney Metro North West service.

Just after 1pm on Sunday, passengers on a driverless metro train at Macquarie Park were forced to leave the train after an issue with one of the doors left it unable to continue its journey.

A transport spokesperson told 10 daily the issue stemmed from a door that was not aligned correctly and said the train had since been taken to Chatswood where engineers were investigating.

Passengers were forced to alight from the train and wait to be collected by another service, with the incident causing further overcrowding at Chatswood station as services experienced up to 20-minute delays.

Passengers wait to board a North West Metro train at Tallawong Station on Sunday. PHOTO: AAP.

John Whinnen who was on another metro service travelling to Rouse Hill said there were a "few hiccups" along the way but overall it was an exciting day to be part of.

Whinnen told 10 News First that one of the doors on their service also had trouble closing and passengers were stuck on the platform for some time before the service could continue.

Crowds gathered at stations across the north-west from early on Sunday morning, with passengers promised a free day of travel as part of the official launch.

More than 57,000 people travelled on the Metro in the first four hours of service, with long queues soon forming at several of the major stations.

57,000 people travelled on the service in the first few hours. Photo: AAP.

Images from Chatswood station showed crowds gathered on the lower concourse and spilling out beyond the ticket barriers.

On Sunday afternoon Sydney Metro said they were aware there were still "some teething issues" that needed to be worked on, but said services had been returned to normal with a train running every 10 minutes.

But the teething issues were not enough to dampen the spirits of the NSW Government who celebrated the new era of Sydney's public transport system on Sunday morning.

Transport Minister Andrew Constance said the metro would "change lives forever" and said it was "all for the community".

"It's a very special day in the life of transport NSW, but an incredible day for NSW," he said.

NSW Premier Gladys Berejiklian cuts a ribbon at the official opening of the North West Metro. Photo: AAP.

NSW Premier Gladys Berejiklian also acknowledged the 22,000 people who were involved in the project and said the metro had not only been delivered on time but more than $1 billion under budget.

"Today is a special day for NSW, it's a special day for Australia, first metro service ever on Australian shores, and we are all proud of that," Berejiklian said.

"But I am proud of this project more than anything because it's a taste of what to come."

Margaret Simmonds who travelled on one of the first metro trains along with the Premier and Transport Minister said the service was "wonderful".

"We are so thrilled to be on it because this is part of history," she told 10 News First.

Monday will be the first big test for the metro service, with the government promising to keep a close eye on feedback from the morning and afternoon peak customers.