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Signal Operating Sequence

It is possible to see signals operating in automatic mode with the passage of a train.  Stamford Brook (District) is just such a location.

The photos below show the operating sequence of signals on the westbound District Line between Stamford Brook and Turnham Green.    The signal is actually two signals on one post.  One is the starting signal for Stamford Brook station while the repeater for the Turnham Green Home signal.   The three photos show the signal displaying red, then green and yellow and then two greens.

Fig. 1: Starting Signal at Red

The westbound starting signal at Stamford Brook (District Line) with the repeater for Turnham Green home signal, at present showing only red behind a train just departed and just visible in the distance.

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Fig. 2: Starting Signal with Green and Yellow Aspects

The starting signal at Stamford Brook now showing green, as the train ahead has now reached Turnham Green station. The Turnham Green home signal repeater here shows yellow because the signal it repeats is red, protecting the train standing in Turnham Green station.

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Fig. 3: Starting Signal with Two Green Aspects

The Stamford Brook starting signal is now showing green plus green as the train ahead is now clear of Turnham Green station and the repeater for the Turnham Green home signal is green.

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