The Cranbourne line through Melbourne's politically sensitive south-east would become the first to be level-crossing free under a Labor promise to remove an extra four crossings if it is re-elected.

On Monday Premier Daniel Andrews announced that crossings at Webster Street in Dandenong, Greens Road in Dandenong South, Evans Road in Lyndhurst and Camms Road in Cranbourne would be removed.

Daniel Andrews at Dandenong station on Monday. Credit:AAP

The road would be lowered beneath the rail line at Webster Road and a rail bridge would be built at Greens Road crossing.

Road bridges would go over the line at the Evans and Camms Road crossings.