Remotely operated vehicle with top guiding and a method of using same

A method for operating a remotely operated vehicle in an automated storage and retrieval system comprising a first downward facing rail system,

• wherein the first downward facing rail system comprises:
• a horizontal base structure extending in a first direction and in a second direction which is orthogonal to the first direction, and
• a first set of parallel downward facing rails arranged in a horizontal plane and extending in the first direction and a second set of parallel downward facing rails arranged in the horizontal plane and extending in a second direction which is orthogonal to the first direction,
• wherein the remotely operated vehicle is a remotely operated vehicle comprising:
• a lower base provided with driving means configured for movement along the base structure in the first direction and/or in the second direction, and
• an upper base provided with guiding means configured for engagement with the first downward facing guide system,
• wherein the method comprises:
• engaging a first set of upper wheels with the first downward facing rail system,
• engaging a first set of lower wheels with a base structure of the automated storage and retrieval system, and
• moving the remotely operated vehicle in the first direction.