I knew it. The Metropolitan, Circle and Hammersmith & City lines all follow the eastbound route from Baker Street --> Great Portland Street and so on. I always wondered why great portland street and euston square station don't have the blob on the tube map since technically speaking, 3 underground lines serve those two stations but they use the same platforms.
They’ve updated them again since! The next station is, we are now arriving at, a better sounding “this is an Elizabeth line service to”, Heathrow T2 and T3 is also now “Heathrow terminals T2 and 3” instead of “Heathrow terminal T2/3”
