(svn r26291) -Fix [FS#5866, FS#5888]: Correctly identify opposite ends of bridges and tunnels when converting rails (adf88)
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		@@ -1515,16 +1515,19 @@ static Vehicle *UpdateTrainPowerProc(Vehicle *v, void *data)
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CommandCost CmdConvertRail(TileIndex tile, DoCommandFlag flags, uint32 p1, uint32 p2, const char *text)
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{
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	RailType totype = Extract<RailType, 0, 4>(p2);
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	TileIndex area_start = p1;
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	TileIndex area_end = tile;
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	bool diagonal = HasBit(p2, 4);
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	if (!ValParamRailtype(totype)) return CMD_ERROR;
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	if (p1 >= MapSize()) return CMD_ERROR;
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	if (area_start >= MapSize()) return CMD_ERROR;
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	TrainList affected_trains;
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	CommandCost cost(EXPENSES_CONSTRUCTION);
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	CommandCost error = CommandCost(STR_ERROR_NO_SUITABLE_RAILROAD_TRACK); // by default, there is no track to convert.
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	TileArea ta(tile, p1);
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	TileIterator *iter = HasBit(p2, 4) ? (TileIterator *)new DiagonalTileIterator(tile, p1) : new OrthogonalTileIterator(ta);
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	TileIterator *iter = diagonal ? (TileIterator *)new DiagonalTileIterator(area_start, area_end) : new OrthogonalTileIterator(area_start, area_end);
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	for (; (tile = *iter) != INVALID_TILE; ++(*iter)) {
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		TileType tt = GetTileType(tile);
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@@ -1639,8 +1642,13 @@ CommandCost CmdConvertRail(TileIndex tile, DoCommandFlag flags, uint32 p1, uint3
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				/* If both ends of tunnel/bridge are in the range, do not try to convert twice -
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				 * it would cause assert because of different test and exec runs */
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				if (endtile < tile && TileX(endtile) >= TileX(ta.tile) && TileX(endtile) < TileX(ta.tile) + ta.w &&
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						TileY(endtile) >= TileY(ta.tile) && TileY(endtile) < TileY(ta.tile) + ta.h) continue;
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				if (endtile < tile) {
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					if (diagonal) {
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						if (DiagonalTileArea(area_start, area_end).Contains(endtile)) continue;
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					} else {
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						if (OrthogonalTileArea(area_start, area_end).Contains(endtile)) continue;
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					}
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				}
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				/* When not converting rail <-> el. rail, any vehicle cannot be in tunnel/bridge */
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				if (!IsCompatibleRail(GetRailType(tile), totype)) {
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