The first named crew is on the Clubhouse Station
633) Curlew (Jeff =B)──────────────────────────────────────────────────────────────┐
│ Champion of the Thames (Affleck =C)
634) Champion of the Thames (Affleck =C)─┐ Champion of the Thames (Affleck =C) ├─────────────────────────────────────────
├─────────────────────────────────────────┘ 4 lengths
635) Poplar Blackwall (Reid =C)──────────┘ 3 lengths