Drivetrain

The drive wheel and piston assembly on a steam locomotive on display at the Railroad Museum Of Pennsylvania in Strasburg, Lancaster County, Pennsylvania.

Technical details:
Busch Pressman Model D 4x5 large format press camera.
Graflex Optar 135mm F4.7 lens in a Graphex shutter.
Arista EDU Ultra 400 B&W film, shot at ISO 400.
8 seconds at F32.
Developed in Ilford DD-X 1+4 dilution for 6 minutes @ 20 degrees Celsius using a Beseler 8x10 print drum placed on Unicolor Uniroller 352 auto-reversing rotary base.  
4x5" negative scanned with Epson V600.