From cd9821fb3978b6759ff567819d981d927d4670be Mon Sep 17 00:00:00 2001
From: tron <tron@openttd.org>
Date: Sat, 6 May 2006 14:32:16 +0000
Subject: [PATCH] (svn r4750) -Fix: Trains could enter certain sloped rail
 tiles under bridges with incompatible rail type

---
 train_cmd.c | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/train_cmd.c b/train_cmd.c
index bb0bd813f9..a4ae5d61e0 100644
--- a/train_cmd.c
+++ b/train_cmd.c
@@ -2627,9 +2627,9 @@ static bool CheckCompatibleRail(const Vehicle *v, TileIndex tile)
 				Slope tileh = GetTileSlope(tile, &height);
 
 				// correct Z position of a train going under a bridge on slopes
-				if (CorrectZ(tileh)) height += TILE_HEIGHT;
+				if (tileh != SLOPE_FLAT) height += TILE_HEIGHT;
 
-				if (v->z_pos != height) return true; // train is going over bridge
+				if (v->z_pos > height) return true; // train is going over bridge
 			}
 			break;