Arriving at Paris Nord (from London) at 18:47. Wanting to take the 19:10 from Paris St Lazare (to Bayeux). Will have a railpass. Is that enough time to take the RER and get there on time?
Taking the earlier train from London is $150 USD more for 2!

I wouldn't even dream of it. You can play with this website:

http://www.ratp.fr

I sincerely doubt if you could hop off your train, run to the RER dragging your stuff and hop on a waiting train, jump off that one and get from the RER to the Bayeux train, all in less than 23 minutes. It might take me that long to walk from the London train to the RER.

You need to look at a map of Paris and check out one of the websites detailing transit options/times within the city. Thee stations are 2 miles apart.

I would think an hour wold be cutting it very close - since your incoming train could easily be 5 or 10 minutes late.

No way! Pay the $150 and relax.

What's a railpass got to do with it? It's absolutely impossible.

Absolutely no guarantee the RER would be running on time. They are usually prompt, however, but sometimes are delayed. Also, navigating the trek from rail to RER platform back to rail, is no small task, even with lots of time. Your only hope - and it is a small one at that is with Taxi. Any chance of a later train to Bayeux?

I think the OP thought their transit would be quicker with a railpass, not needing to buy a ticket. But does the train to Bayeux require a seat reservation? If so, you still need to buy that.

I wouldn't try it. Even though it *may* not be 100% impossible, I would get a heart attack trying to go that fast.

No, No, No.

The correct time to allow for any inter-station change of train in Paris is ONE HOUR.

The actual physical concourse to concourse time by metro can be as little as 25 minutes, the rest is to allow for delays. Your Eurostar will probably arrive at 18:50 or 18:55 or 19:00 anyway.

The trains to Bayeux do not require reservations. If you miss one, you can catch a later train. If there isn't a later train to Bayeux, there is certainly another to Caen. Even if you then have to get a taxi from Caen to Bayeux, that may be cheaper than paying more for a Eurostar ticket. A night in one of the cheap hotels opposite Caen station would be cheaper still.

Definitely not! I would allow at least an hour as everyone above has stated. We have been delayed on the eurostar before so it is possible.

Well, there is ONE possibility, assuming you arrive in Paris on time...it is called a TAXCICAB; otherwise pay the additional fare and arrive earler OR OR OR get a LATER train onward..or is the one you are thinking of the LAST one for the day (doubtful).

I saw a later train, at 20:45. Is it not good for you?