It's the regional métro network in the Paris (Ile de France) Region - Réseau Expresse Régionale. (I live near it) The lines don't have numbers, they have letters - RER Ligne A, Ligne B, Ligne C and so on. It's operated jointly by the RATP and the SNCF and covers a wide distance around Paris (la Grande Banlieue).
Le couloir is 'the corridor' in French.
on the
the foot
Le quai (masc.) is the quay, the wharf.
le coude (masc.) is the elbow in English.
Joinville-le-Pont - Paris RER - was created in 1859.
A common nickname for the RER (Réseau Express Régional) in France, particularly in the Paris region, is "le RER." Sometimes, it's informally referred to as "le train de banlieue," meaning "suburban train," as it connects central Paris to its suburbs. Each line of the RER is also often referred to by its letter designation, such as "RER A" or "RER B."
Le couloir is 'the corridor' in French.
"Le pouce" in French translates to "the thumb" in English.
Le menton means 'the chin' in French.
'le serpent' is the French word for 'the snake'.
le mois means 'the month' in French.
le penseur means the thinker in French.
le canard (masc.) is the duck in French.
"Le mur" in French translates to "the wall" in English.
The RER is a Paris suburban train service. It does not go to Le Havre. You can go from CdG to Gare du Nord on the RER, from Gare du Nord to Gare Saint-Lazare on the metro, and from Saint-Lazare to Le Havre by train. The SNCF website will help you with this.
"Le Nouvel An" in French is "the new year" in English.