16 traction motors, powered by four generators, in turn driven by two V16 ALCO 251C diesel engines. Two generators, driven by two engines, were used for jacking, steering, lighting, and ventilating. Two generators were also available to power the Mobile Launcher Platform. The crawler's tanks held of diesel fuel, and it burned . Due to their age and the need to support the heavier Space Launch System and its launch tower, in 2012–2014 the crawlers were undergoing an upgrade involving "new engines, new exhausts, new brakes, new hydraulics, new computers"; CT-2 was further upgraded in 2014–2016 to increase its lifting capacity from . The crawlers traveled along the Crawlerways, to LC-39A and LC-39B, respectively, at a maximum speed of loaded, or unloaded. The average trip time from the VAB along the Crawlerway to Launch Complex 39 is about five hours. Each Crawlerway is deep and covered with Alabama and Tennessee river rock for its low friction properties to reduce the possibility of sparks. In 2000, NASA unearthed and restored an Apollo-era segment of the Crawlerway to provide access to High Bay 2 in the VAB in order to provide protection from a hurricane for up to three Shuttles at the same time. Kennedy Space Center has been using the same two crawlers since their initial delivery in 1965. They are now nicknamed "Hans and Franz", after the parodic Austrian body-builder characters on Saturday Night Live, played by Dana Carvey and Kevin Nealon. In their lifetime, they have traveled more than , about the same driving distance as from Miami to Seattle. Future use Crawler-Transporter 2 NASA currently plans to use crawler-transporter 2 to transport the Space Launch System with the Orion spacecraft atop it from the Vehicle Assembly Building to Launch Pad 39B for the Artemis missions. Early in 2016, NASA finished upgrading crawler-transporter 2 (CT-2) to a "Super Crawler" for use in the Artemis program. NASA performed a rollout of the Artemis 1 Space Launch System and Orion on March 17, 2022 for the first Wet Dress Rehearsal, and the rollout for launch, which launched in November 2022. The rollout for the WDR, marked the first time one of the crawler transporters rolled a launch vehicle to the launch pad since STS-135. Crawler-Transporter 1 NASA had originally planned for crawler-transporter 1 to be used by commercial launch vehicles. In April 2016, then Orbital ATK, now Northrop Grumman Innovation Systems,