The level crossing was the main way out of Newport northwards via Thomas Street.
The white arrow points to the old prison in Mill Street, known as the clock house. It took this name from the old Clock House which DID have a clock.
Note Brunel's broad gauge railway. At this time High Street Station consisted of two platforms with three tracks between them and no overbridge. The tracks coverged into just two east of the station just before Thomas Street level crossing.
(Image from "Through Seven Reigns - A History Of Newport Police Force 1836 - 1959")