Manchester, November 1940

 As the war continues and secrets threaten the railway girls, they will discover the true meaning of friendship.

 For Dot, her job on the railways is everything. Transporting parcels around the country gives her pride that she is doing her bit for the war effort, but a growing friendship causes problems when home and work collide.

 Joan loves her boyfriend Bob dearly, but when tragedy strikes, her heart is torn apart, and she is forced to make a decision that could hurt those she loves most.

 Meanwhile Mabel has finally found a place to call home and her relationship seems to be going from strength to strength. However, the relentless bombing in the Christmas blitz is about to destroy everything she holds dear, and she will need her friends' courage and generosity now more than ever.

 Brought together by their work on Manchester's railways, the three women find that with the support and encouragement of each other, they can get through even the most challenging of times.