That depends on the contract, if it says you have to work x you have to work x, while I was in the private sector my contract clearly stated my hours of work, with little tolerance.
However where there is a long standing practice of rosters being agreed and voted on before introduction it is bad business to publicly commit to services which there is no agreement to run.
One of the key issues ongoing here is not strictly the rosters but the fact staff are being put under pressure to work rest days to cover for the lack of staff, thats what is cancelling the 6:30 and 17:35 trains.
Drivers are entitled to have 2 days a week off one of which is to fall on a weekend, there is a hint at a need to work possibly 6 rest days a year, in a safety driven business rest days are important, note the strict regulations applied to aircraft pilots, its the same kind of thing, the first thing you will see in most rail accident reports is the shift pattern of the drivers involved
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