My husband and I will be transferring between the two stations on a Monday late September. Using bonjour raptand the man in seat 61, I believe I’ve found that Metro Line 13 passes through Gare Montparnasse on the minus one level. I found the entrance for the Metro on a station map. Here’s the quandary.
Does it actually do this? Asking because I’ve found other info that conflicts. I would find it more difficult to believe that we would have to leave the station and walk to another stop rather than being able to do the transfer within the station, much as a like transfer we did from Eurostar to whichever station we departed from for southern France (Gare du Nord to Gare de Lyon?).
I can’t purchase our tickets yet, but want to be able to give us enough time for the transfer plus some fudge time to make it comfortable.