Door at Battersea Park marked "C.S & T.E. Dept"

[Jan Mayen]

At the South end of Battersea Park station there is a door marked C.S & T.E. Dept Private.
Can anyone tell me what the letters stad for, please? Many thanks

 

[Gloster]

At the South end of Battersea Park station there is a door marked C.S & T.E. Dept Private.
Can anyone tell me what the letters stad for, please? Many thanks

Could it be Chief Signalling & Telephones Engineer‘s Dept. (Or Telegraph or Telecommunications, depending on date.)

 

[Jan Mayen]

OK. Thank you.

 

[station_road]

Could it be Chief Signalling & Telephones Engineer‘s Dept. (Or Telegraph or Telecommunications, depending on date.)

Or Chief Signal & Telegraph Engineer if very old