South Hills Junction Web Page

[Jim Holland]

Greetings!

Jim Holland wrote:

>         Actually the tunnel measurment I have is 3,498 feet.  IF you could make
> your outside radius 24" and the inside radius 22" and spiral down and
> then up 3 loops each and crossing over from outside to inside or inside
> to outside spiral in each direction,

	Sorry, Bob  --  that is 12" radius, 24" diameter and 11" radius or 22"
diameter.  Need the diameter to figure the circumference of the circle
and I mistakenly used it as radius in this report!

James B. Holland
------- -- ---------
        Pittsburgh Railways Company (PRCo), June of 1949 -- June of 1953
    To e-mail *off-list,* please click here: mailto:pghpcc at pacbell.net
N.M.R.A.  Life member #2190; http://www.mcs.net:80/~weyand/nmra/