I was on my way to school in 1973 when something strange happened.

I was on my way to school in 1973. I was late and decided to take the rail road tracks, as us kids usually did.  The next thing I remember is wondering the hallways of my school with no memory of who I was or where I was supposed to be. 
I passed the girls restroom and went inside.  I splashed cold water on my face and looked at myself in the mirror.  Slowly I started to come to myself about two class periods later and was able to make it to class.  Later that evening, I told my sisters and brothers about what had happened.  They believed me. I didn't tell anyone else (until today)  My family agrees that it seems as if I was drugged.  I still have a memory block because I can not recall what happened to me on those railroad tracks.
Witness indicates that the date of the incident is approximate.  PD