When Ken Russell started sweeping platforms at a Kent station aged just 15, he could never have dreamed he would still be working on the railways almost 58 years later. Which is quite remarkable for someone who admits they were never an especially enthusiastic train buff. But now he has been reflecting on his long career, which saw him serve at numerous stations across the county, as he finally takes his well-earned retirement, aged 73. When Ken first picked up a broom to keep the station clean at Adisham in 1966, passenger steam trains had only recently be assigned to the history books. But h…