This is a series.
The series started with "The Escape" and was continued in two volumes by writer Benjamin Legrand, replacing Jacques Lob, with The Explorers published in 1999 and The Crossing in 2000. A fourth volume, Terminus, was written by Olivier Bocquet and published in 2015, as a conclusion to the series.
In a harsh, uncompromisingly cold future where Earth has succumbed to treacherously low temperatures, the last remaining members of humanity travel on a train while the outside world remains encased in ice.
The surviving community are not without a social hierarchy; those that travel at the front of the train live in relative luxury whilst those unfortunate enough to be at the rear remain clustered like cattle in claustrophobic darkness. Yet, things are about to change aboard the train as passengers become disgruntled...