Collins Russian Dictionary 2nd Edition © HarperCollins Publishers 2000, 1997:
aboard [əˈbɔːd] prep (position) (NAUT, AVIAT) на борту́ +gen (:train, bus) в +prp (motion) (NAUT, AVIAT) на борт +gen (:train, bus) в +acc
adv
to climb aboard(ship) сади́ться*(сесть*perf) на кора́бль (train) сади́ться*(сесть*perf) в/на по́езд
* is used to mark translations which have irregular inflections. The Russian-English side of the dictionary gives inflectional information.
Русский: