Consecutive state governments have been scolded by disability groups and senior law firms as Queensland’s new trains failed to meet international disability access standards.

The Human Rights Commission refused an application made by the Palaszczuk government for a three-year exemption for failing to include disabled toilets on board, despite the $4.4 billion price tag on the trains.

Repairs for the trains to meet those standards could cost taxpayers $150 million and people with disabilities could lead to possible legal action taken against the government for incidents in train toilets.