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Yes, it goes on the M4. The journey was faster, and more comfortable, than the Piccadilly Line. My photos app isn't cooperating and it's refusing to load the photos from the last time I used it.
PL-4 is the Acton Town to Rayners Lane service which does not use the M4. Is this the PL-3 that you are referring to, which does Hammersmith non-stop to Heathrow T23 via the M4? It normally uses coaches but red buses have not been strangers to the run.
It's one of very few rail replacement services I know of that's actually faster than the train it is replacing!
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