That Ermakov book was first published in 1995. The 90s were the lawless decade for the freshly collapsed USSR, and there's no end to horror stories I heard and read about those times... but they were unique in that respect, those times I mean.
I did take that trip as a toddler, and I could swear I remember stuff -- except my mom told me stories about it later, so it's hard to tell now which ones I really remember and which ones came alive for me based on what she told me. If anything, according to my mom people on the train were afraid of me, because I looked like a much younger child but talked like a much older one --
they thought I was some bewitched infant, and some old ladies discreetly made the sign of the cross...