i am trying to start a n gauge layout.I have bought SL 310 fish plates but they seem to small.It a second hand track Peco.Am i doing something silly.
No, those are the correct ones for Peco code 55 or code 80 track.
Hi Streak, and welcome to the forum :wave:
As Malc says, you have the correct fishplates for Peco N gauge track.
Better they are too tight than too loose!
Make sure the end of the rail is a clean cut. You may need to file a small amount off the bottom of the rail to assist.
Also check the joiner as sometimes they can get a little bent. You can always open them up a little and then squeeze them back together when you have them in place.
many thanks for all your replies very helpful thank you.