Who is in the second station in Joseph Conrad's Heart of Darkness?

In Joseph Conrad's novel, Heart of
Darkness, there are three stations that Marlow visits on his trip through the
Congo.

The second station is called the Central
Station. It is at this location that Marlow is supposed to get his ship which
will carry him to the third station (known as the Inner Station) to pick up Mr. Kurtz
who has been in the interior of the jungle for an extremely long time. Rumor has it that
he is ill, but no one has heard from him; the only way the Company still knows that he
is alive is from the shipments of ivory that he continues to send
back.

When Marlow reaches the Central Station, he meets the
manager, the brickmaker, the manager's uncle and a mechanic whom he befriends; he also
finds that his ship in under water. Another (junior) skipper had ripped the bottom of
the ship open on the rocky bottom of the river and it sank. In order to continue his
journey, Marlow will have to repair it, which he expects will take several months. He
finds some difficulty getting parts to complete his task: he continues to order rivets,
but the orders are, mysteriously, never filled. Eventually Marlow enlists the help of
one of the mechanics (formerly a boiler-maker, a widow with six children), and although
the rivets take their time arriving, they eventually show
up.

Marlow is able to complete the repairs to his ship and
resume his journey to find and retrieve Mr. Kurtz.