Simplify the following text for a Grade 8 native English-speaking person.
Original: Platforms 1 and 4 at Aldgate are two of the only three platforms on the network to be served exclusively by the Circle Line ( the other being Platform 2 at Gloucester Road ) .
Simplified: Platforms 1 and 4 at Aldgate are the only two platforms on the network to be served exclusively by the Circle Line .