Rail travellers will longer have regular direct services from Bellshill and Uddingston to key stations on the Argyle Line from the end of this year.
A new timetable is being introduced by First ScotRail on December 14, aimed speeding up journey times between Glasgow city centre and Motherwell.
But the changes involve switching services to and from Lanark, which go through Bellshill, from the Glasgow Central low level line to the high level.
That means that, apart from peak times, there will be no direct services from Bellshill and Uddingston to stations such as Dalmarnock, Bridgeton, Argyle Street and the SECC.
Ths would affect people travelling to events at venues such as Celtic Park, the SECC and the Hydro or shoppers using the St Enoch Centre.
ScotRail say the new timetable will reduce journey times between Motherwell and Glasgow to 24 minutes from the current 29 or 35.
But a spokesperson confirmed: “The December timetable has no direct services during off peak hours from Bellshill to Argyle Street, Bridgeton etc. Off-peak generally means after 9.15am.
“However, commuters from Bellshill will continue to have such services during peak hours and there will be four Bellshill trains each way an hour to/from Glasgow Central.
“The off peak amendment has been made because journeys to these stations from/to Bellshill are relatively small compared to the journeys to Glasgow Central.
“And Bellshill passengers travelling to stations on the Argyle line will still have access to them via an interchange at Cambuslang, where the waiting time is typically below five minutes.
“That means travel to and from special events at the SECC or Celtic Park is still available with the change of trains at Cambuslang.”
St Enoch Centre shoppers going back to Bellshill will no longer be able to use adjacent Argyle Street station, but will have to walk to Glasgow Central High Level.
The changes are being introduced 11 days before Christmas.
Commuters changing at Cambuslang will have a ‘window’ of less than five minutes to make their connecting service.
Transport minister Keith Brown said: “Passengers will be able to take advantage of even more services to their places of work, study and leisure.”