92. The smell of a carriage
Right, let’s try and settle this for good. Or at least arrive at some kind of mushy consensus.
Here are my suggestions:
Nice-smelling carriages
Piccadilly line
An airing cupboard full of freshly-laundered towels.
Jubilee line
A reading room in a provincial library, lined with photocopiers and computers.
Victoria line
An all-night pharmacy.
Metropolitan line
The future.
Not-so-nice-smelling carriages
Bakerloo line
Damp coats left on radiators.
Central line
An examination hall full of adolescents.
District line
A defrosted freezer cabinet.
Circle line
A defrosted freezer cabinet in high summer.
Ambivalent-smelling carriages
Waterloo and City line
Ablutions and excretions.
Northern line
Free newspapers.
Hammersmith and City line
Ambivalence.
150 great things about the Underground 
Having climbed aboard one of the new Hammersmith & City line trains this morning, the straight-out-of-the-depot smell is definitely “Weed smoker, just departed”.
That does seem to be the defining smell of the new S Stock trains. The ones on the Metropolitan Line often smell strongly of weed, and on my first journey by S Stock on the Hammersmith and City a few days ago it was exactly the same. I guess it’s because they’re one big long sealed tube, so the smell has nowhere to go except around the air con. If some cheeky little n’er do well has a late night toke on any other line the smell quickly goes out the window.
Sometimes the Central line is more like a hot oven full of baking trays.
What about best sounding Tube Line? For me it’s the Jubilee line.
You and me both: https://150greatthingsabouttheunderground.com/2012/03/29/9-the-sound-of-a-jubilee-line-train/