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-rw-r--r--src/transparency.h1
1 files changed, 1 insertions, 0 deletions
diff --git a/src/transparency.h b/src/transparency.h
index 54ba24e93..08b13ca9b 100644
--- a/src/transparency.h
+++ b/src/transparency.h
@@ -29,6 +29,7 @@ enum TransparencyOption {
TO_STRUCTURES, ///< other objects such as transmitters and lighthouses
TO_CATENARY, ///< catenary
TO_LOADING, ///< loading indicators
+ TO_TUNNELS, ///< vehicles in tunnels
TO_END,
TO_INVALID, ///< Invalid transparency option
};