His childhood friend Danny Merritt, who has sailed with me since he was a teenager, was sitting alongside on the taffrail.
From the theatlantic.com
Those not reaching all the way to the taffrail are called short stern timbers, while those that do are called long stern timbers.
From the en.wikipedia.org
The stern is the rear or aft-most part of a ship or boat, technically defined as the area built up over the sternpost, extending upwards from the counter rail to the taffrail.
From the en.wikipedia.org
The stern now came to a point rather than a flat panel or a gentle curve, and the counter reached from the sternpost all the way to the taffrail in a continuous arch.
From the en.wikipedia.org
More examples
The railing around the stern of a ship
The upper part of the ship's stern, usually ornamented with carved work or molding.
Some maintain that the world taffrail is a combination of three words, namely -- the after rail. Others claim it is a misspelling of the Dutch word "Tafareel" which means painting on the stern.