The statement "East Berlin S-Bahn trains ran through without stopping when trains crossed into West Berlin territory" is doubly confused - it was WEST Berlin U-BAHN trains that ran through without stopping when trains crossed into EAST Berlin territory.
The statement "East Berlin S-Bahn trains ran through without stopping when trains crossed into West Berlin territory" is doubly confused - it was WEST Berlin U-BAHN trains that ran through without stopping when trains crossed into EAST Berlin territory.