Baltimore and Maryland transportation officials are strategizing ways to secure “national scenic byway” designation for historic Charles Street, a plan that could mean changes from new development restrictions to a public trolley line.

The 12-mile stretch of Charles Street between Interstate 95 in South Baltimore and Lutherville already enjoys state-level designation, but federal recognition could mean new funds for improvements, officials said. The 15-page plan unveiled Wednesday, the first step in the process of national designation, also suggests basic improvements including a sidewalk on both sides of the street and crosswalks at all traffic signals.