u/BeatTheMeatles420

I always found the Circle line interesting in how its direction is communicated to passengers since most other cities use ‘clockwise’ or ‘inner circle’. So I made a table keeping track of all the destinations that a train cycles through in a typical Hammersmith-Edgware Road return journey. I also compiled a list of interesting things I have noticed below.

On the shared section with the H&C, TfL seems to minimise references to the Circle line:

• All Circle line trains doing short hops between Hammersmith and Moorgate are indicated as H&C trains, unless it was already in service as a Circle line train and later got diverted.
• All westbound Circle trains after Aldgate show up as H&C trains in TfL’s API, unless it is being routed via the Circle again
• The Hammersmith branch is rarely referred to as a Circle line service.
  • District and Piccadilly line announcements at Hammersmith don’t mention the Circle line
  • Circle line trains not heading to Hammersmith only announce ‘change for the H&C line’ at Edgware Road and not the Circle line

Special services don’t follow a clear pattern. I would also appreciate corrections or additions to this section:

• Circle line trains going in a loop during disruptions or extremities of service hours continue to use the same patterns as above for the ‘via’ destinations.
  • Could be confusing for people since technically a westbound train to Hammersmith is also a 'Circle line via Paddington’, but this is what is used to refer to trains going in a loop
• Aldgate terminators from Hammersmith are shown as ‘to Aldgate’
• Tower Hill terminators from Hammersmith follow the same ‘via’ pattern for its destination
  • In-train DMI can’t seem to cope
• Circle line trains terminating at High Street Kensington from Barking are shown as ‘to High Street Kensington’
• Circle line trains terminating at Barking from High Street Kensington are indicated as District line services
• Early morning trains from Acton or Barking show the ‘via’ destination as if it was on the main Circle