I’ve been wiling away some hours watching German cab-ride videos. While the sheer extent of the infrastructure continues to impress I remain surprised that mechanical boxes still seem quite prevalent. For example Hanau, east of Frankfurt-am-Main still seemed to have three, maybe four mechanical boxes, and this on a line with regular ICE traffic. Is there a reason why they did not seek to resignal with quite the haste that was seen in the UK. While there are semaphores in third rail areas I can’t immediately think of any on 25kv AC overhead, though maybe Stockport semi counts as Absolute Block but with colour lights.