Soazig Parassols will appear in a Paris courtroom on Tuesday to argue her case that she should be receive €45,000 ($59,000) for the job loss.
The young lawyer was employed by a Lyon-based law firm in 2010, reported radio station France Info on Tuesday.
To get to work, she took a train from the town of Ambérie-en-Bugey, to the east of Lyon.
Parassols claims that the 50 kilometre train journey to Lyon was frequently delayed, sometimes by as much as an hour.
At the end of a month, the law firm decided to end her contract despite saying her performance had been excellent. The sole reason for letting her go was her persistent lateness.
The woman's lawyer, David Métaxas, told the radio station the claim was justified.
"Nearly every day the trains were late. She had to leave early to travel these 50 kilometres. The delays were up to one hour and fifteen minutes. Longer than the journey itself," he said.
SNCF lost a case in July where it was forced to pay €800 in damages to a woman who missed a day of work due to a seven hour delay on the high speed Lyon-Paris train line.