I'm sure you will learn that quickly. You can make different lengths of trains for different lines, or you can add any car (doesn't matter what) to single engine assets (like a DMU) that don't have a car at all and then convert that to a second "engine" with the IPT mod.

Gotcha. Will give it a try. There's just so many train assets on the workshop I'm not using simply because it's too short for the platform..

Thanks. I did this in the asset editor. You just have to change the number of cars from "3" to "5". Not counting loading times, this takes about 30 seconds, with most of the time used for typing the asset name before saving.

Wow this comes out suprisingly well... Which mod did you use to adjust the number of cars?