einsteigen

verb
  1. To enter or board a vehicle, such as a train, bus, or car. verb
    Please wait until the train has stopped completely before you einsteigen.
    She watched as the passengers began to einsteigen the bus.
  2. To get involved or participate in an activity or business. verb
    He decided to einsteigen in the new project at work.
    Many investors are eager to einsteigen in the booming tech industry.