diff --git a/src/rail.h b/src/rail.h
--- a/src/rail.h
+++ b/src/rail.h
@@ -38,6 +38,7 @@ struct RailtypeInfo {
 		SpriteID single_s;     ///< single piece of rail in the southern corner
 		SpriteID single_e;     ///< single piece of rail in the eastern corner
 		SpriteID single_w;     ///< single piece of rail in the western corner
+		SpriteID single_sloped;///< single piecs of rail for slopes
 		SpriteID crossing;     ///< level crossing, rail in X direction
 		SpriteID tunnel;       ///< tunnel sprites base
 	} base_sprites;