I used to work on the SkyWay at
Disneyland back in the day. On the Tomorrowland side the smells of the Autopia cars (gasoline) and the Submarine ride (diesel) would waft up to the station, mingled with the char-grilled burgers from Coke Terrace all shift long. Now those smell instantly take me back in time, and the odd thing is, they evoke memories of 80's music that the bands would play every night on the rising stage at Coke Terrace. I actually
like the smell of diesel trucks and buses now because of these associations.
I have since learned (I am a clinical psychologist) that the nerves from our nose run straight through the memory areas (hippocampus) and emotional centers (amygala) of our brains. So smells can elicit strong memories and associated feelings. Whether the monorail smells like cat pee (laughed loud and long at that one

), cow poo or carpet glue, the association to a pleasant place is what makes it endearing.