Help:VE266

Multiple values found for engine spec param <kuid:xxx:yyy>/tag-name (Value1 and Value2)

This error may be logged from Route or Session load and indicates that traincars in the world are using the same engine asset, but with different engine spec values.

This generally means that trains have been placed into a map, then had their engine assets locally edited, and then more instances of the train placed in that same map. In older versions of Trainz the traincars would all separately save the configured engine spec values, and locally editing the spec would not affect the already placed trains. This is still somewhat supported, but Trainz now only saves one set of engine spec values per (version-specific) engine asset KUID.

Resaving the Route and Session will stop this error being logged, but it is random which set of engine values will be used. It is therefore recommended that each instance of the affected traincars is deleted and re-placed, and the Session retested to ensure train performance has not drastically changed (and made the session incompletable or similar).