Many manufacturers just print the double arrows on sector and Trainload Freight loco models instead of providing etched stainless steel ones. To suit 'OO'/'EM' gauge models (4mm scale). The etched range is slowly on the increase too.
DCC Concepts 200g Ballast Tub 4mm Scale / OO Gauge Select from drop down menu
4mm Scale OO Gauge of 4 Wagon Buffers
Proprietary 4mm Scale OO Gauge Pony Truck Nice Condition #5 Pos Hornby Dublo
GWR SIPHON 01 body only 4mm scale OO EM S4
GWR & Western Region 4mm scale (OO) waterslide signal transfers for MSE & Ratio
3D resin printed 4mm scale (OO Gauge) model railway Balustrade - straight
