Othellos stamtavla
| Derwen Tennessee Express RWD 3 (SV/D) | Derwen Railway Express WSB 19035 (SV/D) | Nebo Black Magic WSB 4370 (SV/D) |
| Derwen Rosie WSB 16052 (SV/D) | ||
| Derwen Tawela WSB 65614 (FX/D) | Derwen Llwynog WSB 6622 (FX/D) | |
| Derwen TLWS WSB 53082 (SV/D) |
| Powysvalley Desdemona RWD 29 (SV/D) | Derwen Dairy Express WSB 26295 | Derwen Railway Express WSB 19035 (SV/D) |
| Derwen Duchess WSB 45116 | ||
| Derwen Dawns-Y-Don WSB 73631 (SV/D) | Derwen Adventure Boy WSB 20463 | |
| Derwen Dymuniad WSB 56229 |