All of the Farmington branch bridges were replaced in the 1920s and 30s with steel structures. The original bridges were all wooden trestles or Howe Truss. They could handle K-27s, K-28s, and the 375, but not K-36s and K-37s.
Jimmy Blouch's dispatcher sheets show work trains on the Farmington branch replacing bridges in the 30s and I have AFEs showing replacement of bridges in the late 20s. All the bridges on the Farmington branch are second hand bridges from the D&RGW standard gauge.
Friday January 18, 1935
Work extra 375 with derrick
Conductor Edmiston
Engineer Klahn
Worked with B&B at Bridge 485.58
Tied up Farmington