2 Axle / 4 Wheeled Passenger Cars in JGR/JNR Era

[Steve]

Hello there,

 

does someone know how long 2 axled / 4 wheeled Passenger Cars without bogies/trucks survived on the Japnese States Railways Networks?

 

I had read in the past that few survided even into the JNR Era until the early 1950s on remote Lines, but can't remember when and where it was...