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.
Derived metrics
Computed by ships.fyi from the core specification — see how we calculate these.
How big is it, really?
The SS Ideal X's length overall, against things you already know the size of.
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.
The numbers
| Length overall | ≈160 m |
|---|---|
| Beam | ≈20.7 m |
| Type | Converted T2 tanker with a spar deck for containers |
| First container load | 58 × 35 ft containers |
| First container voyage | 26 April 1956, Newark → Houston |
| Built | 1945 (as Potrero Hills) |
| Fate | Storm-damaged 1964; scrapped in Japan |
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Last verified: 2026-07-15 · Spot an error? business@luck.fyi
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 Ideal X line
The experiment
Who operates the Ideal X
No current operator — this ship's sailing days are over. The operators of record are below.
Ideal X, asked and answered
How long is the SS Ideal X?
How big is the SS Ideal X compared to the Titanic?
Who operated the SS Ideal X?
Does the SS Ideal X fit through the Panama Canal?
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Sources
Primary
- Smithsonian — the container revolution ↗
- Marc Levinson, 'The Box' (Princeton University Press) ↗
- PortNewark/Port Authority NY & NJ — history ↗