He climbed 'aboard' just as the train was leaving.
Everyone 'aboard' was injured in the accident.
She got 'aboard' [='on board'] the train.
(..) - Mr Hawk, pursuit course. Engage. - Aye, sir. - What? - I can hear them. I have a patient here who insists on coming to the bridge. - Welcome aboard, Mr Worf. - Thank you, sir. - The Defiant? - Adrift, but salvageable. - Tough little ship. - Little? Mr Worf, we could use some help at tactical. (..)1996 Star Trek: First Contact
(..) Perhaps today is a good day to die. Prepare for ramming speed. Sir, there's another ship coming in. It's the Enterprise. - The Defiant is losing life support. - Beam the survivors aboard. They've destroyed the admiral's ship. - What is the status of the Borg cube? - The outer hull has been damaged. (..)1996 Star Trek: First Contact