Where did this fall off

[Alan564017]

Sorry about the poor picture, this is something that has fallen off a tara mines wagon, its about 2mm x say 8mm, cant for the life of me find out where it goes. I found about three of them on the layout so far. 

[Robert Shrives]

Hi 

I think you will find it is the axle box retainer , just a push back in IIRC .  

Robert 

[Alan564017]

many thanks Robert