They were not classified on the CGR but a year later , when they were taken onto the SAR roster , they were designated Class 4 .
Beatty as a heavy mixed traffic locomotive with Stephenson valve gear and that used saturated steam , they were built by NBL .
NBL were not classified on the CGR but a year later , when NBL were taken onto the SAR roster , NBL were designated Class 4 .
Beatty as a heavy mixed traffic locomotive with Stephenson valve gear and that used saturated steam , they were built by NBL .