Agreed, half hourly pre covid stoppers between Sheffield & Doncaster, reduced to hourly before reduced further to 2 hour gaps with one diagram missing.
No doubt the trams are popular from Rotherham Central (also might be cheaper as well), considering in some hours there are no Northern trains calling in one direction
There is a question over whether all the pre Covid services can be reasonably accommodated on this stretch of railway. If CrossCountry aren't coming back then maybe, but otherwise the second stopper is the obvious candidate for removal.