The first named crew is on the Surrey Station
16) Thames (=D)─────────────┐ Kingston (=E) ├────────────────────────────┐ 17) Kingston (=E)───────────┘ 1/4 length │ Kingston (=E) ├──────────────────────────── 18) Thames Tradesmens' (=C)─┐ Twickenham (=C) │ 4 lengths ├────────────────────────────┘ 19) Twickenham (=C)─────────┘ 4 lengths