The Ashton Valve company supplied safety valves, steam gauges,whistles, and other Railroad items for around 100 years. although they produced items for locomotive, stationary, and marine boilers, the back bone of the business was the railroads.
check out the history below and if you have any Ashton Valve stories,please contact me.
https://www.gracesguide.co.uk/Ashton_Valve_Co