NML:Deactivate other NewGRFs
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deactivate(<grfID>[[, <grfID2>], ...]);
With this statement, you can deactivate other NewGRFs. As parameters, you can supply any number of grfids (4-byte strings) to deactivate. Note that using this feature to block incompatible grfs is highly discouraged. Instead, disable your own grf with an error message via the error()
statement.