Passengers on Perth's trains have the highest satisfaction rating of all rail commuters in Australia, according to research.

It is the fourth year in a row that consumer research company Canstar Blue has named Transperth as providing the best urban train system in the nation.

Transperth was awarded the maximum five stars for overall satisfaction.

Adelaide Metro, Queensland Rail and Sydney's City Rail each achieved four stars, while Melbourne's Metro Trains received three stars.

Transperth was awarded the maximum rating in six of the eight categories assessed in the survey.

They received four stars out of five for ticket price and safety.

Other categories included service reliability, trip comfort, timetables and scheduling, and train and station cleanliness.

WA Transport Minister Dean Nalder said it was an excellent result, particularly considering that only one other urban system scored five stars in any category.