Sidings had to be built to allow trains to pass.
It has the advantage of increasing track capacity by allowing trains to run much closer together.
We kept pulling into sidings next to the single track to allow other trains to pass.
The train stopped at Modane for 1 hour to allow other trains to pass.
The tracks were not completely deactivated by the system, thus allowing trains to move out.
In 2011, the platforms were lengthened to allow longer trains.
A station master was appointed in 1914 allowing opposing trains to pass.
This allowed trains once started by the driver to run automatically and stop at the next station.
This allowed trains to continue running throughout the renewal process, however the new bridge was no longer wide enough to carry two tracks.
It would allow international trains to run directly into the key main lines beyond London.