The first named crew is on the Bucks Station
339) Eton Excelsior (=E)───────────────────────────┐
│ Eton Excelsior (=E)
340) Wallingford (=C)────┐ Wallingford (=C) ├─────────────────────────
├─────────────────────────┘ 2 1/2 lengths
341) Marlow (=D)─────────┘ 2 1/2 lengths