I recently tried to make some notes on different controllers from Agnew (1937) and now realise that I have some confusion.
My notes say that District Line trains (other than 1920 F stock) had controllers similar to the BTH controllers on Standard Stock, with 3 notches Shunt / Series / Parallel giving automatic acceleration through 7 series and 6 parallel steps.
Other information I have seen on the District Railway states that A, B, C, D, E stock had BTH controllers with Manual notching ( presumably 9 notches - 5 series and 4 parallel ).
There seems to be a contradiction here.
Is it the case perhaps that up as far as G stock were built with manual notching controllers and that after the introduction of K stock, that when WT54B motors replaced older motors, that BTH controllers with automatic acceleration replaced those with manual notching up?
Would I be correct also in assuming that most early tube stock had manual notching?
Does anyone know specifically about the CLR Ealing stock or the original Watford joint stock?
Automatic notching is often provided on controllers which have individual notches for each position. The driver moves the handle to 'full series', for instance, and the ACTUAL controller, which is mounted elsewhere on the car, notches up automatically until it reaches the selected position.
I’m not sure for certain regarding the hand noticing element of the controllers although most of the GE69 motors were replaced by GE212 in the 1920s-30s. Ultimately the C-D-E stock also got the WT54B motors and until conversion to Q stock were compatible with the G/K/L stock motors.
Piers Connor will know the answer to these questions though and if you are a member of the LURS (London Underground Railway Society) there has been a series of articles on early electric trains.
I don't see that the motor type would affect the control side of them. Having learnt the CLR motor cars as converted to de-icers in 1970 I ought to remember. I know they had a central button deadman.. I never got to work one in anger, only a quick shunt up and down the siding in Ealing Common!
I don't see that the motor type would affect the control side of them.
You are right that changing the motors alone would not require a change of control system.
However, I believe, and it would be good to have this confirmed, that the G stock was built with automatic acceleration, in order to be compatible, the earlier units (all built with manual notching up) would then need to have their control system replaced as well as their motors.