After 1 May 1943 the above units underwent changes as follows:
After 5 June 1944 the above units underwent changes as follows:
From 2001 onwards the units underwent conversion to Class 225.
After 25 March 1946 the above units underwent changes as follows:
After 12 March 1944, the above units underwent the following changes:
After 28 June 1950 the above units underwent changes as follows:
The company's five units have since undergone consolidation or other changes in top management and focus.
The first unit is already undergoing testing as of June 2012.
After 18 May 1944 the above units underwent changes as follows:
After the war, the above units underwent changes as follows:
