To further promote his ideas, Arnoux' gauge was over 5 feet and his line extended further south into open country from a junction at Bourg la Reine.
But the brave inventor's work was all in vain as some upstart yank invented the bogie thus reducing the need for Arnoux' complex linkage. So it was the the line was converted to standard gauge overnight on 20th/21st May 1891. Modern railway enhancement project planners and managers please note - OVERNIGHT!
The wiggly line into Sceaux itself was abandoned and a revised branch built to the community at Robinson. On the plan below, "north" is to the left and the brown line (and tunnel) is for a proposal to rebuilt the line into Sceaux itself, a plan superseded by the Robinson extension.
Whilst a pleasant building, the new station ...