Pressing the Low Speed Button causes it to light up and report that Low Speed is on but it appears to have no effect. I believe it should limit the power output to the equivalent of Notch 1 and cut power when the speed reaches 2 mph. Am I no using it correctly or is it non-functional? I got the info above from the TSC West Coast Main Line Trent Valley manual which is very informative and written by someone who appears to know their subject, do such people no longer exist at DTG to write manuals or is their absence for TSW just a cost cutting exercise?