Phase IVb was the name given to Amtrak's newest paint scheme applied on passenger cars, now the most common paint scheme seen on Superliner equipment.
Phase IVb was the name given to Amtrak's newest paint scheme. Amtrak's newest paint scheme was now the most common paint scheme. This most common paint scheme was seen on Superliner equipment. This Amtrak's newest paint scheme was applied on passenger cars.