HomeShips › SS Ideal X

SS Ideal X

Pan-Atlantic Steamship (Sea-Land) · Container · Scrapped 1964 · built by Marinship

Ideal X was a converted wartime tanker carrying 58 metal boxes on deck. That voyage, on 26 April 1956, is the founding event of everything else on this board.

Length overall160 m
Beam20.7 m
Capacity58 TEU
Speed15 kn
Delivered1956
Draft9 m
Our numbers

Derived metrics

Computed by ships.fyi from the core specification — see how we calculate these.

Length-to-beam ratio#10 of 45
7.73 length overall ÷ beam
Sense of scale

How big is it, really?

The SS Ideal X's length overall, against things you already know the size of.

SS Ideal X160 m
Eiffel Tower (height)330 m
Titanic269.06 m
Football pitch105 m
Boeing 747-876.3 m
Blue whale25 m
You (probably)1.75 m

The 747-8 bar is the longest airliner ever built — our sibling site aircraft.fyi measures everything that flies the same way.

One SS Ideal X = 0.59 Titanics · 1.5 football pitches · 6 blue whales · 2.1 Boeing 747-8s laid end to end.

Specification

The numbers

Length overall≈160 m
Beam≈20.7 m
TypeConverted T2 tanker with a spar deck for containers
First container load58 × 35 ft containers
First container voyage26 April 1956, Newark → Houston
Built1945 (as Potrero Hills)
FateStorm-damaged 1964; scrapped in Japan

Last verified: 2026-07-15 · Spot an error? business@luck.fyi

The story

What makes it different

On 26 April 1956, a converted Second World War tanker left Port Newark for Houston with fifty-eight aluminium boxes bolted to a deck frame. Loading them had cost 15.8 cents a ton. Loading the same cargo loose, by hand, cost $5.86 a ton — a thirty-seven-fold difference that trucking entrepreneur Malcom McLean had computed and nobody in shipping had wanted to believe.

Ideal X was not much of a ship — a standard T2 tanker built at Marinship in 1945 — and that was the point. The revolution was the box: standardised, sealed, lifted from truck to ship to truck without anyone touching the freight inside. Longshoremen's unions saw the future immediately; one famously remarked he'd like to sink 'that son of a bitch.'

Every 24,000 TEU giant on this site is the compound interest on that voyage. The container cut the cost of moving goods so far that distance nearly stopped mattering, and modern global trade — Asia's export economies included — is the direct result. Ideal X herself was storm-damaged and scrapped in 1964, three years before the first purpose-built cellular ships made her breed obsolete.

The class

The Ideal X line

The experiment
One of two T2 tankers Malcom McLean's Pan-Atlantic converted in 1955–56; purpose-built cellular container ships followed within a decade and made the conversion concept obsolete.
Operators

Who operates the Ideal X

No current operator — this ship's sailing days are over. The operators of record are below.

USPan-Atlantic Steamship (Sea-Land)Malcom McLean's Pan-Atlantic Steamship Company — renamed Sea-Land in 1960, the company that built the container age.1
Quick answers

Ideal X, asked and answered

How long is the SS Ideal X?
160 m (525 ft) length overall — the #45 longest of the 45 ships on ships.fyi, and 1.5 football pitches end to end.
How big is the SS Ideal X compared to the Titanic?
The SS Ideal X is 0.59× the Titanic's length — 160 m against her 269.06 m.
Who operated the SS Ideal X?
Pan-Atlantic Steamship (Sea-Land) — the ship is no longer in service (scrapped 1964).
Does the SS Ideal X fit through the Panama Canal?
Yes — at 160 m by 20.7 m on a 9 m draft, the SS Ideal X fits the original Panamax locks, and the larger Neopanamax locks with ease.