The first four cars on this train go in one direction and the last four cars go in another direction at one point, so be careful which car you get on.
These eight cars split in half at one point, so make sure you take the right one.
1) The first four cars on this train go in one direction and the last four cars go in another direction at one point, so be careful which car you get on.
「途中で前4両と後ろ4両は別の方向に行くので、どっちの車両に乗るか気をつけてください。」
A go in one direction and B go in another direction を使って言い表してみました。
2) These eight cars split in half at one point, so make sure you take the right one.
「これらの8両は途中で半分に切り離されるので、正しい車両に乗るように確認してください。」
split in half 「半分に別れる」を使って言い表してみました。
ご参考になれば幸いです!