How was this Semaphore Signal used?

[Tallpaul70]

Attached is a pic of the Down Bay starter signal at Maidenhead. The bay is in fact a through platform. In the down direction there are three routes:- Left to the up goods yard and bidirectional goods loop, straight on to the single line branch, and right to the Branch carriage siding.

Did the route indicator work just with the main signal arm or also with the smaller calling on arm?

In earlier times there had been a three arm bracket signal for the three routes. I assume this had to go due to poor sighting line when the Middle Signal Box beside the up goods loop was replaced by the box shown in my picture.

Many thanks for any thoughts?

Best regards
Paul

[LC&DR]

Although I am not familiar with the location I would suggest the Route Indicator works with both the main and calling on arms. That presumes of course that there is a calling on route permitted on the routes concerned.