Amiens is located 120 km North of Paris. You reach Amiens by train from the "Paris - Gare du Nord" station in Paris. If you arrive by airplane the best choice is to land at the Paris-Charles de Gaulle airport. Then, you need to take the R.E.R. line B and go to the train station "Paris nord" or "Paris - Gare du Nord". Finally, you reach Amiens by train. SNCF schedules are available here.