One of its most prominent models, aside from the Kenworth K100 that's often theorized to be the basis for Optimus Prime, was the Kenworth ... These include the T800W and the C500, which have ...

This includes the OEM’s W900 (W900L and W900B models, T800W (wide-hood), and the C500 models. Production will cease in 2026. Kenworth said the decision is due to evolving emissions regulations ...

Original story follows: A source with knowledge about the manufacturer's plans confirmed Tuesday that Kenworth would phase out the W900L, W900B, T800W and C500 models due to tightening emissions ...