
Gare du Nord Station

Ernest and Hadley used to go to the horse track at Auteuil to relax and possibly make some money. They would leave from the Gare du Nord train station and go "through the dirtiest and saddest part of town and walked from the siding to the oasis of the track." They enjoyed that patch of greenery that the track provided just outside the middle of urban Paris.
Ernest found it to be hard work, as he put it; learning about the horses, the odds, jockeys, owners and track conditions. Hadley would bet on the long shots, with little study, and often with good results.
Eventually, Hemingway found that he was spending too much time and money at the track and gave it up as a bad habit. The End of an Avocation, is the name of the chapter in "A Moveable Feast."