martinm wrote:So what do people do with unfilled track?
Surely it should not be above rail level?
The droplets certainly must always be above rail level!
Although I use Dingham's I think the same principle applies. On Manston Brewery I have a section of infilled track with an electromagnetic just below rail level and it works fine. You can just see it between the wagon and the loco on page 1, 2nd photo down. https://www.scalefour.org/forum/viewtopic.php?f=101&t=2819 The electromagnets are those supplied by Dingham's.