I work on what is now known as Blackpool light rail. 1 of 12 peeps "four Teams" 27 miles of overhead infrastructure and 11 substations to look after. Although I would suspect the intricate stuff Barney does? 6.6KV into the sub through our rectifiers and feeds the OLE with 750DC. Just routine maintainence now we hope. We have taken 3 winters to overhaul the complete system ready for 19 Flexity 2 to run a 10 minute service. 10 guys one unimog an engineering car and a dray.