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to board (a train, plane, etc.); to get into (a car); to get on (a bus); to go on board; to get aboard
to march into; to enter; to arrive (at, in)
警察が現場に乗り込んで犯人を逮捕した。
The police rushed to the scene and arrested the criminal.
彼女は最終バスに駆け込んで乗り込んだ。
She dashed over and boarded the last bus.
子どもたちが次々とバスに乗り込んでいる。
The children are boarding the bus one after another.