The cables were attached to carriages, which ran on I-beams on the top of the trestles.
In others it is constructed of iron or steel I-beams and channels.
The center sills are 5-inch I-beams, faced on both sides with Southern pine.
The cross-bridging and needle-beams of 5-inch I-beams are unusually substantial.
The girders upon which it runs consist of 12-inch I-beams, which ...