I bet you didn’t see this coming, but “E” is for engine 😀
ENGINE ~ A machine which acts both to power and operate.
There is a town north of us called Junction City where I took this picture. Yep, you guessed it, there are A LOT of trains with a junction. The trains run right through the center of town. You literally have to pull over to let trains pass.
There is also a #RailArt term called #EndToEnd that is pretty simple to understand. The graffiti is LITERALLY painted from END TO END.
And while these last two aren’t END TO END they do fit our letter E.