Note that num is an extended byte, see <ahref="https://newgrf-specs.tt-wiki.net/wiki/GRFActionsDetailed">GRFActionsDetailed</a>.<br/>
If the size of the data does provided is not valid for the given property, the attempt to set the property MAY be ignored or partially applied.<br/>
If the size of the data provided is not valid for the given property, the attempt to set the property MAY be ignored or partially applied.<br/>
Note that each use of the mapped property ID is followed by Num-info iterations of the size and data pair above. See: <ahref="https://newgrf-specs.tt-wiki.net/wiki/Action0">Action 0 Specification</a>.