steam locomotive doctor syn on crossing on marsh doctor syn a15 inch steam locomotive passing over west hythe level crossing on romney hythe and dymchurch railway kent 4-6-2 pacific built in 1931 designed by henry greenly The Romney, Hythe, and Dymchurch Railway (RH&DR) is a famous narrow-gauge steam railway located in Kent, England, and it has a collection of steam locomotives with their own unique names.