BoltBus, a low-cost interstate bus line, said it will start nonstop service between Baltimore and Washington and Newark, N.J., on March 24. All seats on these routes will cost only $1 through March 27. The new service offers four round-trip schedules between Newark and Baltimore and Washington Monday through Thursday and six round-trips Friday through Sunday. Buses will stop at the Newark Greyhound terminal, adjacent to Newark Pennsylvania Station, at Penn Station in Baltimore, and at two stops in Washington: Union Station and New Jersey Avenue NW at F Street NW. For fare and schedule information, go to www.boltbus.com.