148. Authority is sole judge of its requirements.

The railway or other authority is the sole judge of what it requires, whether it requires only the surface1, or the surface with the mines2 and minerals3, or only the mines and minerals, or only part of the mines and minerals, provided the authority acts in good faith; and the only evidence required is the opinion of the surveyor, engineer or other officer of the authority, unless the surface and mineral owners can show that the authority is not acting in good faith4. Want of good faith may be shown in various ways, for example by proving that the