diff --git a/src/ai/api/ai_bridgelist.cpp b/src/ai/api/ai_bridgelist.cpp
new file mode 100644
--- /dev/null
+++ b/src/ai/api/ai_bridgelist.cpp
@@ -0,0 +1,25 @@
+/* $Id$ */
+
+/** @file ai_bridgelist.cpp Implementation of AIBridgeList and friends. */
+
+#include "ai_bridgelist.hpp"
+#include "ai_bridge.hpp"
+#include "../../openttd.h"
+#include "../../bridge.h"
+#include "../../date_func.h"
+
+AIBridgeList::AIBridgeList()
+{
+	/* Add all bridges, no matter if they are available or not */
+	for (byte j = 0; j < MAX_BRIDGES; j++)
+		if (::GetBridgeSpec(j)->avail_year <= _cur_year)
+			this->AddItem(j);
+}
+
+AIBridgeList_Length::AIBridgeList_Length(uint length)
+{
+	for (byte j = 0; j < MAX_BRIDGES; j++)
+		if (::GetBridgeSpec(j)->avail_year <= _cur_year)
+			if (length >= (uint)AIBridge::GetMinLength(j) && length <= (uint)AIBridge::GetMaxLength(j))
+				this->AddItem(j);
+}