Getting around Paris is a challenge of its own when you’re a wheelchair user like Franck Maille, a former para-athlete and representative of APF France Handicap, a disability charity. Although the French capital promised to improve accessibility for the Paralympic Games, which opened on Wednesday night, the city’s public transport network remains nearly impossible to navigate for passengers with reduced mobility. The first stage of Maille’s arduous journey starts in Nanterre, in the western suburbs of Paris. For him to get into the city centre, he needs to take the RER (an inner-city train). T…