Triang Class 31 R357 in BR Green D5572 00 Gauge. Most likely 1963-1965 model as it only has Triang logo on underside, not Triang Hornby.
Model: Class 31 Brush (Type 2) Locomotive - Unboxed
Running Number: D5572
Category: Deisel Electric
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In good overall condition, motor seems to run fine, untested on open track.