The cutoff is due to placing the car on a "straight" rail instead of a "curved" one (see the video).
save-file https://yadi.sk/d/MymAk-VoMfNZMg
video https://yadi.sk/i/6iaTbHLjigkTEw
[1.1.2] In /editor, when copying, trains are cut off
Re: [1.1.2] In /editor, when copying, trains are cut off
Sorry, but this isn't likely to ever be fixed. It's just a quirk of trains in blueprints; they do not function nicely when around curved rails.
If you want to get ahold of me I'm almost always on Discord.