As CFM 960 finished taking water at Sawmills on 29 June 1987, 20th Class 742 arrived with train 28, the 12:45 Mpopoma - Thomson Jn freight. Both locos had 'Double Mountain' 4-8-2+2-8-4 wheel arrangements but the 20th was a larger and more powerful loco than its Mocambiquan cousin.