Carry Very Fast

Ancient Aliens map01 uses Boom scrollers (specifically action 253). The speed and direction of movement are determined by the length and orientation of the line. Would recommend opening it up in the editor to see how it's done.

ZDoom has its own scrollers. The section at the bottom of this page will show you how to replicate those action 253 scrollers in ZDoom.

You can also split the line and make the scroll action happen more than once to speed it up too right? At least I seem to recall that happening in Boom maps I've made.