Sturgeon insists there are tough sanctions in placepublished at 12:12 Greenwich Mean Time 20 December 2018
Mr Carlaw says two years ago the transport minister handed out £3m of discounted fares to passengers to compensate for problems on the railway.
The current transport minister has instead decided to waive sanctions and bail out the owners of the rail franchise, he argues.
Ms Sturgeon insists there are tough sanctions in place.
The first minister says she understands the frustrations passengers have, but stresses that average rail fare increases in Scotland are actually lower than in England and Wales.