Paris has an excellent underground train system, known as the Metro (short for Chemin de fer metropolitain, Metropolitan Railway). Although you will probably take the RER subway train from the airport to Paris, don’t be confused: RER isn’t the name for the “French subway train”, and only a few large stations serve the RER network of trains. Look for the Metro stations, marked with a large “M” sign.
There are 16 Metro lines (lignes) (1 14, 3bis, and 7bis) on which trains travel all day at intervals of a few minutes between 5AM and 12:30AM (Saturday night/Sunday morning: 1:30AM), stopping at all stations on the line. Times for trains can be seen on an electronic scrollboard above the platform. Line 14, which is fully automated, is called the Meteor. Scheduled times for first and last trains are posted in each station on the centre sign. Generally, except for early and late hours, travellers should not worry about specific Metro train times; just get to your station and take the next train, which will likely be in 5 10 min.
Many of the trains do not carry destination binders. All lines on the Paris metro run end to end with some trains terminating at certain stations. This practice is used only in peak hours and if you are on a metro train that is not terminating at one end, the driver would make an annocement (in French). Listen carefully for certains signs that the train is terminating at another station.
The lines are named according to the names of their terminal stations ( the end of the line). If you ask the locals about directions, they will answer something like : take line number n toward “end station 1”, change at “station”, take the line nn toward “end station 2” etc. The lines are also colour coded.
In addition, there are five train lines: RER A, B, C, D, and E. RER trains run at intervals of about 6 7 min, and stop at every station within Paris. Although a regular subway ticket can be used within Paris (Zone 1), it is necessary to pass the ticket through the turnstile when passing between the subway and the RER lines, as the two systems are separate networks. This ticket is necessary to enter and exit the RER networks, as the RER trains travel on to the Parisian suburbs, outside the zone where a regular subway ticket can be used. Beware that travelling outside the city centre without a valid RER ticket will get you fined, and the packs of inspectors who roam the system show no mercy to tourists pleading ignorance. In particular, Charles de Gaulle airport is not within the city, and you’ll need to purchase a more expensive RER ticket to get there (see Get in).
In addition to RER, there are many suburban train lines departing from the main train stations. One line of interest is the one from Gare Montparnasse to Versailles Chantiers, a quick way to go to Versailles castle (covered by a ticket for at least Zones 1 4). The alternative is to use RER C to Versailles Rive Gauche (this station is the closest to the castle). Do not use RER C8 to Versailles Chantiers; this will do a very long loop in the southern suburbs before reaching Versailles.
For travel outside of the Paris zone, the train arrival times are shown on a monitor hanging from the ceiling inside the RER station above the platform. Information about the stops to be made by the next incoming train is presented on a separate board also hanging from the ceiling. It is important to check this board before boarding the train, as not all trains make stops at all stations on a given line. Four letter codes (VERA, TOPU, etc.) are used for the RER and suburban trains. The first letter indicates the destination of the train, the others may have other meanings or may have been chosen to make it easily memorized. You can look up what these codes mean on information panels in the station, but the easiest and fastest way is often to check the board hanging from the ceiling.
RATP  is responsible for public transport including metro, buses, and some of the high speed inter urban trains (RER). The rest of the RER is operated by SNCF. However, both companies take the same tickets, so the difference is of little interest for most people except in case of strikes (RATP may strike without SNCF doing so or the other way round). Current fares can be found at their website. Basically, as you move farther from Paris (into higher zones), tickets get more expensive.
For the subway, a single ticket (ticket t+) costs €1.70; however, it is generally not advisable to buy tickets by the unit. Instead, purchase a carnet of ten tickets, which can be bought for €12 at any station, which will bring the price per ticket down to €1.20. Tickets named tarif reduit may be purchased for children under the age of 10 but only in a carnet of 10 for €6. Both tickets are valid for unlimited metro and RER or bus and tram transfers during two hours for RER and metro, and 1 hour 30 between the first and the last punch for bus and tram. RER + Metro and Bus + Tram are two separate systems, but they use the same tickets. This means you have to use a new ticket if you transfer from bus to metro or from metro to bus. Tickets do not expire.
A one day ticket, a weekly pass, and a monthly pass are also available. The price varies according to the zones for which the ticket can be used. The cheapest 1 day ticket called Mobilis , is valid for zones 1 2, with a price of €5.90. Once bought, it is necessary to write in the spaces provided on the ticket the date the ticket is being used in European notation of day/month/year (valable le), the last name (nom), and the first name (prenompp). Unfortunately, this ticket is not valid for use for travel to/from Charles de Gaulle airport. Unless you plan to make many trips in one day, the carnet of ten tickets (for €1.14 per trip) will still be a much better cost than a one day ticket. However, consider the price for all members of your group/family, including children, which days you are travelling on, and in which zones you will be travelling.
For travellers under the age of 26, there is a special ticket (Jeunes 26) that you can purchase for use on the weekends or holidays. The price varies depending on the number of zones you wish to cover (Zones 1 3 is €3.30 and Zones 1 5 is €6.60; there are other zone combinations available too) and the ticket is good for one day of unlimited usage of the metro, RER, bus, and trams.
If you are staying a bit longer, the weekly and monthly passes are called Carte Orange (1 week pass, €17.20 for Paris and inner suburbs) and the monthly Carte Orange Mensuelle (one month pass). Note that an Hebdomadaire (eb DOH ma DAIR) starts on Mondays and a Mensuelle on the first of the month. The Carte Orange is non transferrable and requires the user to provide information on the pass after the sale. Since 2008, the Carte Orange is sold as refill of a Navigo Decouverte no contact pass. This pass is sold for €5. You must write your last name (nom) and your first name (prenom) and stick your photo on the nominative card. After, you have to refill your pass with a Carte Orange Hebdomadaire (one week pass), or a Carte Orange Mensuelle (one month pass). You have to choose at least two of the contiguous “zones”: Paris is the first zone, La Defense is in the third zone, and Versailles in the fourth. Everything related to a “Navigo” pass is in purple (like the target for the pass in the turnstiles).
Although not as good a deal for adults in most cases as the Mobilis or Carte Orange, there are also one to five day tourist passes, called Paris Visite, available, which are a bargain for kids of ages 4 11, starting at €4.40 per day for travel within zones 1 3.
Keep your ticket or pass with you at all times as you may be checked. You will be cited and forced to pay on the spot if you do not havea ticket. The most likely spots for being checked are just behind the turnstiles at big Metro stations or during Metro line changes (correspondances). RATP agents may be present in the Metro stations even on Sunday nights.
Metro stations have both ticket windows and automatic vending machines. The majority of automatic vending machines take do not take notes, only coins or European credit cards with a pin encoded chip on the front. Therefore, to use either euro bills or a non European credit card with a magnetic stripe, it is necessary to make the purchase from the ticket window. Be advised that some ticket vending machines do not give change, so use exact change or go to the ticket window. If you look at the vending machines closely, you may find one in the group that takes euro bills and will give change.
Some larger stations have secondary entrances, where there is no ticket booth. These are labelled voyageurs avec billets (passengers with tickets).
Each station displays a detailed map of the surrounding area with a street list and the location of buildings (monuments, schools, places of worship, etc,) as well as exits for that particular metro. Maps are located on the platform if the station has several exits or near the exit if there is only one exit.
When the train arrives, the doors may not open automatically. In such a case, there are handles located both inside and outside the train that you have to push or unlatch in order to open the door.
Avoid suburban charges
If you have any tickets or Carte Orange for zone 1 2 (inside the Paris area, the lower rate) and want go to La Defense from Châtelet, you have to take the Metro (Line 1). You can take the RER A (and save a few minutes), but you have to pay an additional fare, because even though you arrive at the same station, the RER exit is supposed to be outside of Paris! On the other hand, Metro fares are the same, even in the suburbs. So be careful as there are usually a lot of ticket examiners present when you get off the RER A.
(Text Source: Wikipedia, the Free Encyclopedia)
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