A $1.6 billion Melbourne "sky rail" project was kept secret by the state government to avoid a political backlash, a court has been told.

Residents’ group Lower Our Tracks Incorporated is taking legal action to prevent the construction of an elevated rail track that would remove nine level crossings on the Pakenham-Cranbourne line. They’re seeking a declaration that the government’s decision to allow the sky rail is improper. Documents lodged in the Victorian Supreme…