Flickering signals and horns at Brixton

But the name SATS itself is only a few years old! How many could they have employed by not wasting the money on a name change?

But they aren't even going to be near enough the same. There will be no white aspects for a start, and blue will be making it's first appearance as a signal aspect colour on LU. This mans a major change in the signalling principles, coupled with the new ATP system, a different method of ATO etc...

I'm not so sure. They may need to be as 2009 stock is around 3m longer than 1967 stock.

Basically the same as the present lunar white aspect, but with an important difference. As with lunar white it tells the driver that, after the signal he/she is looking at, there are no more colour light signals protecting the train ahead. However, unlike a lunar white, the driver will be able to pass it in protected manual (which replaces coded manual) as target speeds will be displayed and changes notified in advance.

What I *think* is happening is that blue on the Vic Line post-upgrade is the same as white on the central now. The idea being that a white can't have two different meanings depending on the site which it is displayed at.

I don't think so...

Correct. In fact, the way I heard it, lunar whites will also be replaced by blue signals on the Central Line at some point in the future, though not necessarily to coincide with the VLU.

I would describe the Brixton horn as more of a klaxon, and as mentioned earlier in this thread it is an audible alarm pressed by the arriving driver to tell the departing driver that the rear cab is clear. Although it's usually sounded within 30secs of arrival, I've never seen the starter go green within about 95secs of the train arriving anyway.

Shoreditch's rear cab clear alarm is a bell instead of a klaxon. I can't recall hearing anything audible at Bank and Elephant&Castle for when the rear cab is clear. In fact does Bank even have a rear cab clear indicator?

On the subject of the headwall indicators, I love their curvy retro 1960s design, and hope that they stay in use. There is at least one to be found on the 70s part of the Jubilee, but it didn't have the lights installed, maybe as ATO wasn't used?