Compostage obligatoire, or the Old Woman and the Train

Train dream again. I am walking into a railway station, which reminds me of St Lazare in Paris, and of Historical Museum in Moscow.  The platform I need is very close to the exit. It is dusk, the sky is purple red; it is summer.

I am walking to the second or the third carriage of the train: the old green train Moscow - Prague I used to take when I was small, going to Ouzhgorod for holidays. I see a very old woman, whom I recognize as my mother's school teacher and life-long friend. She is standing on the platform, leaning on the train, very weak, her face has no expression. There are other people around - her family, among them I remember a boy of about 9 years old, perhaps a grand-son. 

I am heading towards the group to say hello. A younger woman whom I do not know, her daughter, greets me and says someything like, "How lucky! I was going to ask you to take care of my mother". 

I am going to answer "Of course! With pleasure" when I realize that I have no tickets. In a flashback, I see these tickets (2 of them) in my mother's hands, back home. They look exactly like the SNCF tickets I am so used to, and they are not there. And I think, "Oh! This is because I thought I had an electronic ticket!". 

Then the dream fades - I do not see the departure, and do not know if the old woman took the train.