Hoover-Mason Trestle tracks

A section of narrow gauge track from the Hoover-Mason Trestle at the old Bethlehem Steel blast furnaces in Bethlehem, PA.  The trestle was used to carry materials destined for each of the five blast furnaces that operated there. 

Technical details:
Bronica SQ-A medium format film camera with a Bronica Zenzanon 80mm PS lens.  
Kodak Tmax 400 shot at ISO 400.
1/15th second at F22. 
Developed in Pyrocat HD at 1:1:100 dilution for 15 minutes @ 20 degrees Celsius in Paterson 3 reel tank.  15 seconds initial agitation with swizzle stick followed by 5 seconds of additional agitation every minute thereafter. 
Negative scanned with Epson 4990 on holders with ANR glass.