After Chapter 16 ending...

Everyone in and on the engine room head to the cart behind it, as Charlie detaches the latch holding the engine cart to the rest of the train. Delta makes his way up the still moving platform, aiming for the engine of said train. Meanwhile, Elm and the girls head to the back, while Alpha and Bravo are at the sides.

Alpha: {Delta, you only got a second}

Delta: {Don't worry. I won't miss}

The train's momentum continued with the engine cart moving further and further away.

Delta's eye sharpen down his sights as the cold wind rushes against him and his gun. The shaking of the train and the speed, would make a shot like this more difficult, requiring Charlie's semblance to make it. "Train go boom", then Delta shot a round through the window and into the engine, blowing up the engine cart to a smoldering wreckage.

Afterwards, Alpha shouted, "Now", and soon he, Bravo and Elm jump off from different sections of the train, while holding the railings, and planted their feet to hopefully slow the train to a halt. The passengers and teammates on train steady themselves with the train finally stopping.