A few days ago I was at Barmouth station heading towards Tywyn when I idly looked at the track below me. Apart from the generally ropey condition of the sleepers, I also noticed that the chairs had BR(W) on them with what possibly could be a date (the numbers were two digit with the first being a "5"). The likelihood then is that the track was laid either in the 1950's or early '60s - so probably at least 50 years old. Which made me wonder: what is the oldest piece of permanent way that is still in regular use by passenger trains (so no sidings, freight only routes etc)?