diff --git a/src/engine_type.h b/src/engine_type.h
index e1b892fb4c..7770388446 100644
--- a/src/engine_type.h
+++ b/src/engine_type.h
@@ -55,6 +55,7 @@ struct RailVehicleInfo {
 	byte visual_effect;             ///< Bitstuffed NewGRF visual effect data
 	byte shorten_factor;            ///< length on main map for this type is 8 - shorten_factor
 	byte tractive_effort;           ///< Tractive effort coefficient
+	byte air_drag;                  ///< Coefficient of air drag
 	byte user_def_data;             ///< Property 0x25: "User-defined bit mask" Used only for (very few) NewGRF vehicles
 };
 
diff --git a/src/table/engines.h b/src/table/engines.h
index 5c47f60972..63c830ddf5 100644
--- a/src/table/engines.h
+++ b/src/table/engines.h
@@ -363,7 +363,7 @@ static const EngineInfo _orig_engine_info[] = {
  * @param k engclass
  * Tractive effort coefficient by default is the same as TTDPatch, 0.30*256=76
  */
-#define RVI(a, b, c, d, e, f, g, h, i, j, k) { a, b, c, {j}, d, e, f, g, h, k, i, 0, 0, 0, 0, 0, 76, 0 }
+#define RVI(a, b, c, d, e, f, g, h, i, j, k) { a, b, c, {j}, d, e, f, g, h, k, i, 0, 0, 0, 0, 0, 76, 0, 0 }
 #define M RAILVEH_MULTIHEAD
 #define W RAILVEH_WAGON
 #define G RAILVEH_SINGLEHEAD