Trying to identify an old 2 x 7 white LEGO plate with a hole in the middle and 4 holes on the side Recently someone gave me a huge bunch of old LEGO pieces. Among the parts I found a white 4x6 plate with 4 wheel holes (those red wheels with a metal pin), a hole in the middle and an 2x1 extension on one end. Here's a photo: 

I suspect that this part is from somewhere between 1960 and 1980. Can anyone identify it? Which sets may contain it?
This is 

Part# 824 :  Train Base 4 x 7 with Wheels Holder

It appears in 2 train sets from 1966