Voie (platform/track) 1 is beside the main station buildings, but two passage ways, which run beneath the railway lines, gives access to voies 2-11.
The main passage way has access to and from voies *platforms/tracks) 2-11 by steps and a ramp.
So if you have luggage don't assume you have to use the stairs; you may gave to walk passed the stairs to access this ramp.
This main passage way is also linked to the main (Nord) departure hall and exits by steps and a ramp; located to the left at the end of the passage way.
However, the secondary passage (when arriving from Paris, this passage will be towards the front of the train) has lift/ascenceur access, in addition to stairs.
Nantes doesn't have a Metro, but it does have a tramway and line 1 has a stop adjacent to the main (north) entrance at Nantes station - the stop is named 'Gare SNCF Nord'
When arriving by train and transferring to the tram, head to for the Nord exit.
The station isn't particularly close to the city centre - it's a 15-25 min walk away - and the simplest route is to use the Nord exit from the station, and then cross the street, turning left when you are the far side of the street and then turn left - walking into the city beside the tram tracks.
It's a three stop hop on the tram to Commerce, the closest tram stop to the city centre on line - take a tram heading in the direction of 'Francios Mitterand'.
The Château des ducs de Bretagne/Castle of The Dukes of Brittany, which now houses the Nantes History Museum is located between the station and the city centre.
It's a 10 min walk - follow the directions above, the walking route to the city centre takes you passed the chateau.
This is one of more than 300 station guides available on ShowMeTheJourney, which will make it easier to take the train journeys you want or need to make. As always, all images were captured on trips taken by ShowMeTheJourney.