Bethlehem, NJ: (Allentown, NJ:) CNJ Roundhouse, Railyards and Towers

Roundhouse: (Satellite, the foundation still exists)

Railyards: (Satellite)

Steel Tower: (Satellite, my guess based on Photo 2, model board and aerial images below.)

Mystery Tower: (Satellite, I think this is the hump yard tower.)

I added Allentown to the title because the main classification yard was near Allentown.

Thomas Wentzel posted
BETHLEHEM ENGINE TERMINAL OF THE CNJ 1940

Dennis DeBruler commented on Thomas' post
The foundation still exists.
40°37'11.6"N 75°24'39.7"W

Dennis DeBruler commented on Thomas' post
I used this topo map to find the roundhouse.
1957 Allentown Quadrangle @ 1:24,000

Barry Trogu posted
CNJ #1707, #1608, #10, N&W #3178, CNJ #1011, L&HR #13, 312 at the Bethlehem, PA engine terminal on April 26, 1969 John Stroup took this photo and it is in my collection.
Daniel C Carroll Jr. shared

Darren Reynolds posted three images with the comment:

Conrails

"Steel" tower 

Bethlehem, Pennsylvania 

This tower is no longer standing

Mike Muschlitz: Worked at Steel Tower between 1978 and 1997. It was a busy interlocking. The switches were pneumatic, 110 pounds of pressure. You had to be aware when working on or around them.

Rich White: Some Mike Bednar photos of the machine can be found on Jeff Seidel's website that I maintain: https://www.railroad-signaling.com/towers/steel.html

Tim Shanahan shared

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Three Mike Bednar photos from the webpage provided in Rich White's comment.

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I spent quite a bit of time looking for the tower east of the railyard based on the track diagram. Then the blank space in the middle of the model board motivated me to look on the west end. It is indeed close to the fork for Athens CP and Canal CP on the track diagram.

Apr 10, 1955 @ 24,000; AR1VII000020075

Since I got the aerial photo  to find Steel Tower, I also got the roundhouse area.

Apr 10, 1955 @ 24,000; AR1VII000020075