Drivers at FirstBus, in the Borders area of Scotland, took 24 hours strike action last Monday.
It was the first of three one-day strikes over pay.
Drivers, members of the Unite union, rejected a 2.5 percent pay offer.
They are demanding a 9 percent pay rise and equal pay with the hourly rates of their counterparts in other areas.
Drivers currently get 75p an hour less than those in Edinburgh.
Unite regional industrial organiser Sandy Smart said, “We are looking for parity with other parts of the company.
“But the company is not prepared to give that.
“It has caused quite a bit of resentment and anger.”
Further strikes by the 100 or so drivers are planned for 18 and 21 June.
An overtime ban by the drivers was also due to start last Tuesday.