  PC Brindle said: "It's a massive risk, as life-threatening voltages run through these stations.  No, voltages do not run. They can be expressed as energy changes when charge moves, or equivalently as line integrals (Faraday's Law). However one does it, one must acquire a technical education; and read plenty of Wittgenstein, thereby assuming eternal doubt.  PC Brindle said: "It's a massive risk, as life-threatening voltages run through these stations. No, voltages do not run. They can be expressed as energy changes when charge moves, or equivalently as line integrals (Faraday's Law). However one does it, one must acquire a technical education; and read plenty of Wittgenstein, thereby assuming eternal doubt.