In September 2008, the Scottish Government's agency Transport Scotland announced that all ScotRail trains (including from the Strathclyde Partnership for Transport) would be eventually repainted in a new, blue livery with white Saltire markings on the carriage ends.
Class 334 re-livery began in November 2010 in preparation for the Airdrie to Bathgate reopening.

On 24 August 2011, ScotRail announced plans to refurbish all the fleet, with the project expected to start in November 2011 and take two years to complete.
334020 was the first to be properly refurbished at Kilmarnock's Brodie Rail Works.
It was there for 3 months from 3 February 2012 to 2 May 2012.
The last unit to receive a full refurbishment was 334006 which left Brodie Works on 8 November 2014.

From early 2015, an extensive overhaul has been carried out by Alstom to the entire fleet to improve passenger conditions, which included the retrofitting of full air conditioning, at-seat charging points, provision for wi-fi, and reliability improvements to the doors.
Additionally, a new CCTV system for Driver Only Operation was installed.
In September 2008, the Scottish Government's agency Transport Scotland announced that all ScotRail trains (including from the Strathclyde Partnership for Transport) would be eventually repainted in a new, blue livery with white Saltire markings on the carriage ends. Class 334 re-livery began in November 2010 in preparation for the Airdrie to Bathgate reopening.
On 24 August 2011, ScotRail announced plans to refurbish all the fleet, with the project expected to start in November 2011 and take two years to complete. 334020 was the first to be properly refurbished at Kilmarnock's Brodie Rail Works. It was there for 3 months from 3 February 2012 to 2 May 2012. The last unit to receive a full refurbishment was 334006 which left Brodie Works on 8 November 2014.
From early 2015, an extensive overhaul has been carried out by Alstom to the entire fleet to improve passenger conditions, which included the retrofitting of full air conditioning, at-seat charging points, provision for wi-fi, and reliability improvements to the doors. Additionally, a new CCTV system for Driver Only Operation was installed.
British Rail Class 334