Freight trains are expected to be a regular feature of the Petaluma landscape this summer as Northwestern Pacific begins service between Windsor and Napa.

The North Coast Railroad Authority is seeking an amended agreement with the city of Novato before service begins.

Novato sued the authority in 2007 to stop the project, but later agreed to a court settlement.

Novato City Council member Carole Dillon-Knutson said that the authority agreed to Novato's wishes for quiet zones, welded track and landscaping.

"With those conditions, we don't have any disagreement with freight trains," she said.

The rail authority wants to change some of the conditions of the court settlement, a request that is scheduled to be considered by the Novato City Council on July 12.

Nina Zhito/for the Argus-Courier

A Northwestern Pacific engine slowly rolls through Petaluma on a test run. NWP plans to begin commercial freight service between Windsor and Napa by mid-July.