Amtrak ordered another seven Turboliner trainsets, which were delivered between 1976 and 1977. These were manufactured by Rohr Industries , and were known as RTL Turboliners.  They were based on the earlier RTG series, but had American-style Janney couplers throughout  and a different design of power car cab .  The standard configuration of each set was five cars: power cars at either end, a food service car, and two coaches.  In that configuration, each trainset could carry 264 passengers.  At times, Amtrak operated Turboliners with an additional coach cut into the consist.  These were the final gas turbine trainsets purchased by Amtrak; conventional diesel locomotive-hauled trains proved cheaper to operate.