"SC" Machine - Schulkill Haven, PA.

Tower controlled the Reading Line from Reading North thru the coal regions. Tower razed (no photo yet).
Machine at Strasburg PA RR museum. (Pictured there)
Left section

Lofty, Haucks, Mahanoy Jct., Tamaqua
...to Milton and Shamokin
Center section (note pic of tower!)

Pottsville Jct.
Right section

Ring, Sand, Molino, Dock, Stone, and Port Clinton
...to Reading