[Milk wagon crossing railroad tracks.]

[Portrait of William Davis Hassler with hat.]

International Signal Corp., Exterior, Erie Train Running on Safety Ramp.

International Signal Corp., Exterior, Erie Train Running on Safety Ramp.

[Portrait of William Davis Hassler.]

International Signal Corp., Exterior, Erie Train Running on Safety Ramp.

[Harlem River, NY.]

International Signal Corp., Exterior, View Looking Across Track Showing Safety Ramp.

[Men standing on dock near ship.]

[House.]

[Elevated Railroad.]

[Train tracks.]

[Men digging near Morris Park Office.]

[Train tracks.]

[Men working on elevated train tracks.]

[Group of men on elevated train tracks.]

[Elevated train tracks.]

[Elevated train tracks.]

[Elevated train tracks.]

[Elevated train tracks.]