Black Cassios stamtavla
| Burhults Black Commence RWD 4 (SV/D) | Derwen Railway Express WSB 19035 (SV/D) | Nebo Black Magic WSB 4370 (SV/D) |
| Derwen Rosie WSB 16052 (SV/D) | ||
| Derwen Sioned RWD 1 (SV/D) | Derwen Llwynog WSB 6622 (FX/D) | |
| Penygarreg Seren Ddu WSB 55334 (SV/D) |
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Powysvalley Desdemona RWD 29 (SV/D)
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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 |