(svn r9341) [0.5] -Backport from trunk (r8943, r8955, r8976, r8999, r9009):

- Fix: NewGRF support for vehicle variable 48 (r8943)
- Fix: crash on loading savegames with GRFs that do not have their GRF info/name set (r8955)
- Fix: reinitialize all engines after grf files have been reloaded/changed (r8976)
- Fix: do not select a disabled platform length/number of track count when going out of drag-drop mode (r8999)
- Fix: play the correct engine sound based on the engine type instead of the sprite (r9009)

openttd.c

@@ -1611,6 +1611,7 @@ void ReloadNewGRFData(void)
 	/* reload vehicles */
 	ResetVehiclePosHash();
 	AfterLoadVehicles();
+	StartupEngines();
 	/* update station and waypoint graphics */
 	AfterLoadWaypoints();
 	AfterLoadStations();