Yesterday I wrote that no cars go down Rue Longue. I was wrong! Here you see 'Le Petit Train' which takes visitors around the town.
So yes, cars - and Le Petit Train - can go down Rue Longue but it's obvious they can't park for long as they'd block the street.
Thanks to Karen, USA who left a comment that Le Petit Train used to come down this street even before the renovation. See her comment below. Thanks Karen!