if station ID is not found, try to look for it as a name and take the first result

It is possible to do both:

traveloob> departures 2656@voyagessncf 2128@voyagessncf

and:

traveloob> departures paris lyon

modules/voyagessncf/backend.py

@@ -104,6 +104,10 @@ class VoyagesSNCFBackend(BaseBackend, ICapTravel):
             station = self.STATIONS[int(station_id)]
             arrival = self.STATIONS[int(arrival_id)]
         except (IndexError, ValueError):
+            try:
+                station = list(self.iter_station_search(station_id))[0].name
+                arrival = list(self.iter_station_search(arrival_id))[0].name
+            except IndexError:
                 raise UserError('Unknown station')
 
         with self.browser: