Grain ship
A grain ship was a type of freighter specifically used to carry loads of grain. The  NCC-G1465 was an example of this kind of vessel. ()

In 2268, Sherman's Planet awaited a shipment of quadrotriticale held at Deep Space Station K-7. At the time, the  was held responsible for protecting the grain until the shipment could be taken to the planet. () 

The following year, the Enterprise escorted two robot grain ships to Sherman's Planet, after it had been struck by crop failures and famine. ()
Spacecraft classifications