I do wonder why Penistone wasn't known as Penistone Junction, what with it being a former junction for Woodhead services.
Could it be because it isn't the place where you changed trains for Penistone [unlike Llandudno Junction, change for Llandudno, etc], rather it is at Penistone?
The GC through Woodhead was the main line, so it you want "junction" in the title, then it should have been "Huddersfield Junction" [as I think the signalbox on the GC line was].