Two rail workers died after being hit by a passenger train between Port Talbot and Cardiff.
Great Western Railway
BBC Radio Devon
Campaigners calling for Great Western Railway to "bring back the buffet car" have been at Plymouth station.
Members of the RMT Union said the removal of the refreshment carriage from the new Intercity Express trains was a step backwards, and they were highlighting their case at the station.
Union spokesman Mick Cash said the replacement trolley service could prove difficult for staff, particularly when trains were busy.
A petition to reinstate the buffet car has been signed by more than 1,700 people.
GWR has been asked for its response to the action.
Primary schoolchildren have recorded safety announcements for Bristol, Bath and Weston-super-Mare stations.