I found these, are these the sort of thing you are looking for...
I'm sure I've seen something either exactly like this or similar to these in Trainz, I'm not too sure what you would put in the DLS search box, I tried BR Totem Signs, but it came up with No Downloads Found.
I'm sure someone on here has either come across these signs in the past or even made them.
Sorry I can't help you any further, but I will keep searching and if I find anything I'll post back here...