How do i turn head while on a rollercoaster

Hi I’m trying to creating a rollercoaster type game. But the problem i’m having is i can’t lock the head too the tracks or route straight ahead and still allow the person to turn their head left and right whilst travelling along . i have looked at the ue4 roller coaster and as great as it is and what i’m looking for but it is based on 4.3 . I originally built project in 12.5 and have packaged it in 13.0 so there have been quiet a few changes since then, i’ve been searching other threads to see or get info,but no joy.
Can anybody give me a pointer or a link that they have seen to help with this please