Subgrade Rankings: What Matters Most to Collectors and Experts

Centering, corners, edges, and surface are the four areas grading companies evaluate when determining a card's overall ...
Fast Company

Roads can crack, rut, and fail. Here’s how to build them well

The next time you’re on the road, remember that it takes a good amount of engineering and tremendous teamwork to create that smooth pavement surface you drive on. While on the road, you’re probably ...
The Conversation

What are roads made of? A pavement materials engineer explains the science behind the asphalt you drive on

Mansour Solaimanian receives funding from Pennsylvania Department of Transportation. In the past has received research funding from Federal Highway Administration and Wisconsin Department of ...
Railway Age

NTSB: ‘Poor Track Conditions’ Led to 2021 Empire Builder Derailment

A combination of worn rail, vertical track deflection, subgrade instability and track misalignment led to the derailment of Amtrak’s westbound Empire Builder on Sept. 25, 2021, which killed three ...