^^ I didn't actually get sick, I just felt that if I didn't get off of the train soon, I probably would have. Those MP59s are like saunas when it's hot outside. It was hot in the other trains too but it felt like the MP59s (and especially on line 4) were the worst.
Anyway, pictures:
MP59 somewhere (I forgot the name of the station)
Arts et Métiers
Entrance to Cité station
Obligatory MP89 shot in Cité station
Entrance to what used to be Saint-Martin station
I did actually go past both Saint-Martin and Champ De Mars while on the métro, and I was surprised by how easy they are to spot.