diff -r 5a8b295aa345 -r 4cc327ad39d5 src/elrail.cpp
--- a/src/elrail.cpp	Tue Mar 27 23:27:27 2007 +0000
+++ b/src/elrail.cpp	Sat Jun 02 19:59:29 2007 +0000
@@ -52,6 +52,7 @@
 #include "viewport.h"
 #include "functions.h" /* We should REALLY get rid of this goddamn file, as it is butt-ugly */
 #include "variables.h" /* ... same here */
+#include "landscape.h"
 #include "rail.h"
 #include "debug.h"
 #include "tunnel_map.h"
@@ -248,7 +249,7 @@
 			Track bridgetrack = GetBridgeAxis(ti->tile) == AXIS_X ? TRACK_X : TRACK_Y;
 			uint height = GetBridgeHeight(GetNorthernBridgeEnd(ti->tile));
 
-			if ((height <= TilePixelHeight(ti->tile) + TILE_HEIGHT) &&
+			if ((height <= GetTileMaxZ(ti->tile) + TILE_HEIGHT) &&
 					(i == PCPpositions[bridgetrack][0] || i == PCPpositions[bridgetrack][1])) {
 				SETBIT(OverridePCP, i);
 			}
@@ -269,7 +270,14 @@
 						continue; /* No neighbour, go looking for a better position */
 					}
 
-					AddSortableSpriteToDraw(pylons_normal[temp], PAL_NONE, x, y, 1, 1, 10,
+					SpriteID img = pylons_normal[temp];
+					SpriteID pal = PAL_NONE;
+					if (HASBIT(_transparent_opt, TO_BUILDINGS)) {
+						SETBIT(img, PALETTE_MODIFIER_TRANSPARENT);
+						pal = PALETTE_TO_TRANSPARENT;
+					}
+
+					AddSortableSpriteToDraw(img, pal, x, y, 1, 1, 10,
 							GetSlopeZ(ti->x + x_pcp_offsets[i], ti->y + y_pcp_offsets[i]));
 					break; /* We already have drawn a pylon, bail out */
 				}
@@ -278,10 +286,10 @@
 	}
 
 	/* Don't draw a wire under a low bridge */
-	if (MayHaveBridgeAbove(ti->tile) && IsBridgeAbove(ti->tile) && !(_display_opt & DO_TRANS_BUILDINGS)) {
+	if (MayHaveBridgeAbove(ti->tile) && IsBridgeAbove(ti->tile) && !HASBIT(_transparent_opt, TO_BUILDINGS)) {
 		uint height = GetBridgeHeight(GetNorthernBridgeEnd(ti->tile));
 
-		if (height <= TilePixelHeight(ti->tile) + TILE_HEIGHT) return;
+		if (height <= GetTileMaxZ(ti->tile) + TILE_HEIGHT) return;
 	}
 
 	/* Drawing of pylons is finished, now draw the wires */
@@ -307,7 +315,14 @@
 			assert(!IsSteepSlope(tileh[TS_HOME]));
 			sss = &CatenarySpriteData[Wires[tileh_selector][t][PCPconfig]];
 
-			AddSortableSpriteToDraw( sss->image, PAL_NONE, ti->x + sss->x_offset, ti->y + sss->y_offset,
+			SpriteID img = sss->image;
+			SpriteID pal = PAL_NONE;
+			if (HASBIT(_transparent_opt, TO_BUILDINGS)) {
+				SETBIT(img, PALETTE_MODIFIER_TRANSPARENT);
+				pal = PALETTE_TO_TRANSPARENT;
+			}
+
+			AddSortableSpriteToDraw(img, pal, ti->x + sss->x_offset, ti->y + sss->y_offset,
 				sss->x_size, sss->y_size, sss->z_size, GetSlopeZ(ti->x + min(sss->x_offset, TILE_SIZE - 1), ti->y + min(sss->y_offset, TILE_SIZE - 1)) + sss->z_offset);
 		}
 	}
@@ -339,7 +354,14 @@
 
 	height = GetBridgeHeight(end);
 
-	AddSortableSpriteToDraw( sss->image, PAL_NONE, ti->x + sss->x_offset, ti->y + sss->y_offset,
+	SpriteID img = sss->image;
+	SpriteID pal = PAL_NONE;
+	if (HASBIT(_transparent_opt, TO_BUILDINGS)) {
+		SETBIT(img, PALETTE_MODIFIER_TRANSPARENT);
+		pal = PALETTE_TO_TRANSPARENT;
+	}
+
+	AddSortableSpriteToDraw(img, pal, ti->x + sss->x_offset, ti->y + sss->y_offset,
 		sss->x_size, sss->y_size, sss->z_size, height + sss->z_offset
 	);
 
@@ -347,18 +369,26 @@
 	/* every other tile needs a pylon on the northern end */
 	if (num % 2) {
 		if (axis == AXIS_X) {
-			AddSortableSpriteToDraw(pylons_bridge[0 + HASBIT(tlg, 0)], PAL_NONE, ti->x, ti->y + 4 + 8 * HASBIT(tlg, 0), 1, 1, 10, height);
+			img = pylons_bridge[0 + HASBIT(tlg, 0)];
+			if (HASBIT(_transparent_opt, TO_BUILDINGS)) SETBIT(img, PALETTE_MODIFIER_TRANSPARENT);
+			AddSortableSpriteToDraw(img, pal, ti->x, ti->y + 4 + 8 * HASBIT(tlg, 0), 1, 1, 10, height);
 		} else {
-			AddSortableSpriteToDraw(pylons_bridge[2 + HASBIT(tlg, 1)], PAL_NONE, ti->x + 4 + 8 * HASBIT(tlg, 1), ti->y, 1, 1, 10, height);
+			img = pylons_bridge[2 + HASBIT(tlg, 1)];
+			if (HASBIT(_transparent_opt, TO_BUILDINGS)) SETBIT(img, PALETTE_MODIFIER_TRANSPARENT);
+			AddSortableSpriteToDraw(img, pal, ti->x + 4 + 8 * HASBIT(tlg, 1), ti->y, 1, 1, 10, height);
 		}
 	}
 
 	/* need a pylon on the southern end of the bridge */
 	if (DistanceMax(ti->tile, start) == length) {
 		if (axis == AXIS_X) {
-			AddSortableSpriteToDraw(pylons_bridge[0 + HASBIT(tlg, 0)], PAL_NONE, ti->x + 16, ti->y + 4 + 8 * HASBIT(tlg, 0), 1, 1, 10, height);
+			img = pylons_bridge[0 + HASBIT(tlg, 0)];
+			if (HASBIT(_transparent_opt, TO_BUILDINGS)) SETBIT(img, PALETTE_MODIFIER_TRANSPARENT);
+			AddSortableSpriteToDraw(img, pal, ti->x + 16, ti->y + 4 + 8 * HASBIT(tlg, 0), 1, 1, 10, height);
 		} else {
-			AddSortableSpriteToDraw(pylons_bridge[2 + HASBIT(tlg, 1)], PAL_NONE, ti->x + 4 + 8 * HASBIT(tlg, 1), ti->y + 16, 1, 1, 10, height);
+			img = pylons_bridge[2 + HASBIT(tlg, 1)];
+			if (HASBIT(_transparent_opt, TO_BUILDINGS)) SETBIT(img, PALETTE_MODIFIER_TRANSPARENT);
+			AddSortableSpriteToDraw(img, pal, ti->x + 4 + 8 * HASBIT(tlg, 1), ti->y + 16, 1, 1, 10, height);
 		}
 	}
 }
@@ -379,8 +409,15 @@
 			if (IsRailDepot(ti->tile)) {
 				const SortableSpriteStruct *sss = &CatenarySpriteData_Depot[GetRailDepotDirection(ti->tile)];
 
+				SpriteID img = sss->image;
+				SpriteID pal = PAL_NONE;
+				if (HASBIT(_transparent_opt, TO_BUILDINGS)) {
+					SETBIT(img, PALETTE_MODIFIER_TRANSPARENT);
+					pal = PALETTE_TO_TRANSPARENT;
+				}
+
 				AddSortableSpriteToDraw(
-					sss->image, PAL_NONE, ti->x + sss->x_offset, ti->y + sss->y_offset,
+					img, pal, ti->x + sss->x_offset, ti->y + sss->y_offset,
 					sss->x_size, sss->y_size, sss->z_size,
 					GetTileMaxZ(ti->tile) + sss->z_offset
 				);