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Can anyone please explain the meaning of the sign showing a black triangle in a white circle. I looked through a catalogue of signs but could not find it. These appear to be multiplying all over the network. From videos that have been put online in the last two years or so, I have noted just...

Sorry this is probably a silly question but yesterday I noticed, from a Birmingham - Liverpool emu, a blue 08 shunter moving an emu in the new South Western livery into or out of the new long Alstom shed at Ditton, where they repainted the AM90 Pendolinos. Would I be right in guessing that South...

Sorry, not possessing mobile telephone apparatus I cannot post a picture, but I have observed at two locations several repeating examples of a sign I do not think I have seen before. It consists of a largish black diamond, with two white diamonds side by side on it. The two locations where I...

Just very recently (in the last two weeks or so) I have noticed that passenger information screens and on station announcements have begun to include specific information on the location of approaching trains, which was not given before. For example, at Manchester Piccadilly P14 the indicators...

Please excuse first a simple question: I have often observed DMUs (both first generation and modern ones) revving their engines hard for a minute, or a few minutes, before starting a journey. I have always thought this was to generate enough vacuum, or air pressure, to release the brakes. Is...