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-rw-r--r--src/rail_type.h5
1 files changed, 3 insertions, 2 deletions
diff --git a/src/rail_type.h b/src/rail_type.h
index ebca7ec35..2bd602a37 100644
--- a/src/rail_type.h
+++ b/src/rail_type.h
@@ -47,9 +47,10 @@ template <> struct EnumPropsT<RailType> : MakeEnumPropsT<RailType, byte, RAILTYP
typedef TinyEnumT<RailType> RailTypeByte;
/**
- * The different roadtypes we support, but then a bitmask of them
+ * The different railtypes we support, but then a bitmask of them.
+ * @note Must be treated as a uint64 type, narrowing it causes bit membership tests to give wrong results, as in bug #6951.
*/
-enum RailTypes {
+enum RailTypes : uint64 {
RAILTYPES_NONE = 0, ///< No rail types
RAILTYPES_RAIL = 1 << RAILTYPE_RAIL, ///< Non-electrified rails
RAILTYPES_ELECTRIC = 1 << RAILTYPE_ELECTRIC, ///< Electrified rails