Sydneysiders are getting their first glimpse inside the driverless metro trains that will take to the North West Rail Link once construction is complete.

State Transport Minister Andrew Constance has unveiled a 13-tonne, full-scale model of the train's front carriage, which is being used for customer testing on site at the Showground Station in Castle Hill in Sydney's north-west.

"This is a pretty exciting glimpse of tomorrow's Sydney," Mr Constance said.

The model includes the distinctive nose section, where passengers will be able to look directly out the front of the train – the point at which a driver would usually sit.

The carriage has fewer seats than a traditional Sydney train, but the seats it does have are covered in padded fabric, unlike other metro trains overseas which have plastic or stainless steel seats.

People stand inside a model driverless train of the type which will be in use when Sydney's North West Rail Link comes into operation. ( Transport for NSW )

In the coming week, school groups, parents with prams, emergency service workers and engineers will test the carriage's accessibility, comfort and safety features.

"We'll take the feedback from future customers on board before the new trains go into full production next year," Mr Constance said.

He said features like seating, safety, lighting, grab poles and hand grips would all be assessed as part of the process.

Feedback would also be collected on the final colour choice for the train.

The trains will have screen door technology which will keep people and objects away from the tracks and allow trains to get in and out of stations faster.

Once the tests are completed, the model will go on public display.

Sydney Metro says the rail link should be in operation during the first half of 2019.