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The title of this article is conjectural. Timetables from the period refer to Allentown–Bethlehem–Philadelphia and Bethlehem–Quakertown–Philadelphia (i.e. descriptive names). A SEPTA employee timetable from 2000 calls the physical line north of Lansdale the "Bethlehem Line" (and I believe this is still the case). Invariably when the SEPTA Regional Rail lines acquired names they were named after their termini, and for all but a year that was Bethlehem. Mackensen (talk) 00:48, 16 August 2016 (UTC) reply

• Conversely, we could call this Allentown–Philadelphia service or Bethlehem–Philadelphia service. SEPTA didn't use the term "Bethlehem Line" for this service, and it does use it for a piece of physical infrastructure. Mackensen (talk) 14:28, 19 March 2018 (UTC) reply