The new AMTRAK high-speed Acela train can reach 150 mi/h, which presently it seldom does, because of

Question:

The new AMTRAK high-speed Acela train can reach 150 mi/h, which presently it seldom does, because of the curvy coastline tracks in New England. If 75% of the power expanded at this speed is due to air drag, estimate the total horsepower required by the Acela.