LINCOLN — Organizers of a cross-country march to raise awareness about climate change petitioned Gov. Dave Heineman on Thursday to release information about rail transportation of crude oil through Nebraska.

Leaders of the Great March for Climate Action and Bold Nebraska said they turned in about 1,500 signatures at the Governor’s Mansion.

Their petition asks the governor to release information on the crude oil volume moved by train and the chemicals blended with oil in train cars and pipelines. Railroads have provided such information to Nebraska emergency response officials, who have honored requests not to release it.

Railroad officials say that the information is proprietary and that releasing it could raise security threats. Other states, including Iowa, have released the information.

The governor declined to comment about the petition.

A half-dozen walkers on the climate march reached the 1,800-mile point Thursday, almost five months after they left Los Angeles. Joined by daily walkers along the way, the marchers are scheduled to arrive in Omaha late next week on their way to Washington, D.C.

March organizers made sure the route crossed Nebraska because of their opposition to the proposed Keystone XL oil pipeline, which would run through the state.

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