I’ve just looked up directions from Abbey Road (940GZZDLABR) to Woodford (940GZZLUWOF), and I’m a little confused by the IDs of replacement bus services for the London Overground. Here are two journeys I received from the Journey Planner API:
As you can see, both journeys use a replacement bus service for the LO from Walthamstow Central Station to Highams Park Station, yet one of these has the ID “L3”, and the other has the ID “london-overground”.
I extract these IDs from the journey leg summary, so in this case these summarys would begin with “Replacement Bus L3…” and “Replacement Bus london-overground…” respectively. I’m confused about why these don’t both list the ID L3 despite being the exact same service (the origin and destination, and the departure/arrival times are the same for both)?
Also, are there any conventions for naming replacement bus services? I know the central line buses at the moment begin with “CL” and then 1 number, and the Piccadilly line replacement buses recently began with “PL” and then a number, so one would assume it’s the line initial + “L”, but what then happens with the Hammersmith & City line which has multiple initials, and is this naming convention always used?