The Paris metro did have 1st and 2nd class sections, but ended them in 1991 [1]
The London underground did as well, but ended them in 1940 during/because of the war [2]
In Paris, it seems that demand fell to non-sustainable levels. This was after enforcement stopped though, which seems like it could be a rather classic example of the free-rider problem!
Comments
The Paris metro did have 1st and 2nd class sections, but ended them in 1991 [1]
The London underground did as well, but ended them in 1940 during/because of the war [2]
In Paris, it seems that demand fell to non-sustainable levels. This was after enforcement stopped though, which seems like it could be a rather classic example of the free-rider problem!
1: http://articles.chicagotribune.com/1991-05-12/travel/9102110...
2: http://en.wikipedia.org/wiki/London_Underground_O_and_P_Stoc...