Hi Rich
R496 is the Super 4 Double Level Crossing. (rarish)
R414 is the Super 4 Double Curved Level Crossing (very rare)
A double level crossing for Series 3 track was never produced and it is difficult to fit the Super 4 crossing to Series 3 track without modification and you don't want to do this as it ruins what is an increasingly rare accessory.
So you will have to run some Super 4 track through the crossing if you predominantly operate Series 3.
Good luck with your search.
vintagemodeller
R496 is the Super 4 Double Level Crossing. (rarish)
R414 is the Super 4 Double Curved Level Crossing (very rare)
A double level crossing for Series 3 track was never produced and it is difficult to fit the Super 4 crossing to Series 3 track without modification and you don't want to do this as it ruins what is an increasingly rare accessory.
So you will have to run some Super 4 track through the crossing if you predominantly operate Series 3.
Good luck with your search.
vintagemodeller