It also gained a transformer that let it work under 25000 volts, 50 Hz AC and French signalling and train protection systems.
1901 operated into Lille Flandres station in France many times as part of the testing process.
By 2001 the testing was completed and it was restored to standard with its original number of 2130.
These Class 21s will have their asbestos removed and be stripped of parts and scrapped in the near future.
The second half of Class 21 is expected to meet the same fate by the end of 2015.