Following Newman's pledge to electrify New York Central rail lines, plans to electrify the Park Avenue line and replace the then-overcrowded Grand Central Depot were announced. In March 1903, Wilgus presented a more detailed proposal to the New York Central board, describing a modern railroad terminal with separate levels for commuter and intercity railroads, among other things. Wilgus's plan was approved, and subsequently, Grand Central Depot was demolished in phases and replaced with the current Beaux Arts-style Grand Central Terminal. As part of the project, the rail yard and the approach from 59th Street were placed underground and electrified. Electric locomotives were placed in regular passenger service in January 1907.