Wheel suspension mechanism from a replica of the John Bull Steam Locomotive No 1 built in 1939 by the shops at the Pennsylvania Railroad in Altoona, Pennsylvania.  Railroad Museum Of Pennsylvania in Strasburg, Lancaster County Pennsylvania.  

Technical details:
Busch Pressman Model D 4x5 large format film camera.
Graflex Optar 135mm F4.7 lens in a Graphex shutter.
Arista EDU Ultra 400 B&W film, shot at ISO 400.
2 seconds at F22.
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 and cropped in post to desired size.