Accessibility in French Train Stations

There is an elevator ("ascenseur") but it appears well hidden. Suggest you ask at the Info desk. There are also escalators but if a wheel chair is involved that would not be too helpful.

Go to this page on the Paris by Train site for lots of information, including photos, on Gare Montparnasse. Scroll down until you come to a station map with a link to the full version of the map. In the upper right-hand corner of the full map page you'll see a red box that indicates the section of the map which is visible. Move the box around to see other sections of the map. Use the "+" and "-" icons on the upper left-hand side to zoom in and out. You'll then be able to see where all the ascenseurs and the taxi ranks are located.