France Trainline
 

Good Morning.
I am trying to book a train from Paris Gare du Nord to Caen for May travel via Trainline. But when I am about to pay, the screen says "Paris St. Lazare". Are this one and the same?
Thanks you,
Isabelle

Sorry, I should have read more and look at the map.
So I need to go to St Lazare for my train to Caen, kindly please tell me how to do it? Take a cab to St Lazare? Or is there a Metro at Gare du Nord? Where do I get tickets to St Lazare or can I purchase it in advance too? And lastly, how long is the travel time between Gare du Nord and St Lazare via cab, uber or metro? Thanks very much!

You can purchase the tickets on line or when you get to the train station:
https://en.oui.sncf/en/

With a little bit of walking you can catch the RER E that goes from one station to the other without any transfer for the cost of a metro ticket. Google Gare Saint Lazare and ask for directions via public transportation.

easy to do via RER E that goes to within a block or so of Gare St-Lazare.

there are metro stops at every single train station in Paris