AZL offers the 60' z scale high capacity or "high cube" box car in 4 road names, TTX, Canadian Pacific, Union Pacific, Burlington Northern & Santa Fe and Norfolk Southern. Blackened wheels, auto latch couplers and roller bearing trucks are featured on these z scale box cars. In recent years “High Cube” — “high cubic capacity” — boxcars have become more common in the USA. These are higher than regular boxcars and can only run on routes with increased clearance. The excess height section of the car end is often marked with a white band so as to be easily visible if wrongly assigned to a restricted gauge line.