We recommend booking assistance as far in advance as possible if you or someone you're traveling with will require assistance with things like getting on and off the train. 

You can book assistance, reserve a seat or a wheelchair space and inquire about facilities and accessibility directly with the railway you are travelling with.

SNCF

Accessibility & mobility service in SNCF - France

TGV Lyria

Accessibility & mobility service in TGV Lyria - France and Switzerland