In March 2023, Guinness World Records designated that refurbished crawler, known as CT-2, as the heaviest self-powered vehicle. The crawler itself weighs 6.6 million pounds, about the same as 1,000 pickup trucks, and it runs on locomotive and large electrical power generator engines. Giles calls it the original hybrid vehicle.

To get its Artemis moongoing spacecraft to the launchpad, NASA's CT-2 uses huge ALCO 251C V16 diesel engines originally built to power trains.

NASA's crawler-transporter 2, carrying the agency's Artemis II SLS (Space Launch System) rocket with the Orion spacecraft, arrives Feb. 25, 2026

NASA is getting ready to send astronauts beyond Earth's orbit for the first time in decades. On track to launch its Artemis II mission as early as February, NASA will spend the next month preparing to send its first crewed mission to the Moon in half a century