Read this following text and answer the question.

Because of construction work, Park Street Station is closed. All passengers for Park Street Station will have to exit the train at Center Station. Bus service is available at Center station to carry passengers to Park Street. After exiting the station, please line up the curb for a bus. Please avoid crowding. Buses will leave frequently, but there may be some delays because of street traffic. We are sorry for the inconvenience. The station is scheduled to reopen in three weeks. Thank you for your cooperation. 

"After exiting the station, please line up the curb for a bus ..."

The word "line up" can be best replaced with ____