The Eurail Pass is not valid for RER Trains in Paris operated by RATP (i.e. RER A, RER B).
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Eurail passes do not cover local transport like trams or metros, only intercity trains. Rail Europe is another company that offers similar European train passes.
If you have an Interrail or Eurail pass you can use Eurostar between London & Lille, Paris, Brussels, Disneyland, Rotterdam & Amsterdam, but you must pay a special passholder fare.
Paris RER TicketsWhen taking a RER train strictly within central Paris Zone 1 (visible in the first RER Map), you can use basic Paris Metro tickets for travel on the RER. Travel beyond Paris Zone 1 on the RER requires a special ticket: a Billet Ile-de-France.
In the metro, your t+ ticket allows you to travel on the entire network.In the RER, your t+ ticket allows you to travel only within Paris. Any travel outside of Paris requires the purchase of a point-to-point ticket (Île-de-France ticket), the price of which is calculated on a station-to-station basis.
Eurail and InterRail are both rail passes, and while they are similar there is one critical difference - who can buy them. Eurail Passes are only for non-European citizens or residents.InterRail Passes are only for European citizens or residents.
Eurail passes do not cover local transport like trams or metros, only intercity trains. Rail Europe is another company that offers similar European train passes.
You can hop on and off most trains as you please with your Eurail Pass, but some trains ask you to buy an additional seat reservation before you can jump aboard.
First class also has wider seats and aisles, and is more likely to have amenities such as air-conditioning and power outlets (though outlets are still rare on Europe's trains, in any class). While first class is less conducive to conversation, it's more conducive to napping.