Duplo rail accessory compatibility with older trains Are the new Duplo rail accessories, like #6225521 and #6225519  (appearing in, for example Duplo #10872: Train Bridge and Tracks; #10874: Steam Train; and #10875: Cargo Train) compatible with older Duplo trains (for example, #10507: My First Train Set and #10508: Deluxe Train Set)?
Physically, these parts are compatible. They simply rest in between the rails. Various elements have made use of the space between the rails for years, such as points:



Older trains don't have any way to understand the function elements and respond accordingly, but they won't derail or anything like that.