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As a special treat after InfraRail, I waited for a Class345 from Stratford to Liverpool St. Photos show the OPO antennas exactly where "Watto" told me (thanks Watto!) - see photos. I was shown around the cab by a nice driver who said that the OPO wasn't yet working at Liverpool St, so I...

Now my next puzzle on this obscure yet fascinating transmission system, is about how the platform images are displayed on the Class 345 in-cab OPO CCTV monitors, as per the photo enclosed. On this particular platform, there are 4 cameras "cropped and spliced" together. As you can see they are...

Ahah, that would explain it. So the antennas are at the back of the train, albeit the back of the semi-independant half-set. That allows the OPO system to be completely independant per EMU half-set, with the downside that only the last half of the platform is seen by the driver as he leaves the...

Thinking more about the antenna situation on the Class 345s, why would there be two antennas in the middle of each side of the train? Why not just one each side? It makes sense to have two on each side of eg Jubilee, as they are under the cab ensuring the whole length of the platform can be seen...

Ah, only at the 8 new underground stations. According to Crossrail puff, that’s roughly 4km of platform edge screens in total!

Ah, that's also interesting. The LU stock doesn't do that, it stays on until they have left the station and then when there is no RF (thus video) signal received, the screen goes blank, so they are not dependant on speed, but limitation of the length of the leaky feeder. Does anyone know if...

Hi Watto - thanks for that info! That's interesting then, because on the Jubilee et al trains the antennas are under each cab, with the rear ones always active. This means that the OPO picture is not displayed in the cab until the train is fully in the platform. When the train leaves, the rear...

I hear that the Class 345 OPO CCTV System uses leaky feeder under the platform edge lip to transmit the signals tio the trains, like on the Jubilee Line. But looking at photos I can't see the antennas under the drivers cab like they are on the Jubilee Line stock. Does anyone know more about...