The Southern Railway made good use of older and redundant lengths of bullhead rail, reusing it for many applications, such as sign posts, fencing posts, and of course, signals. This model faithfully replicates the distinctive design of this signal.

Replacing the previous Ratio 490, 491 and 492 kits, this versatile kit can be built in one of three ways: home signal, distant signal, and a combined home and distant signal. The old white metal parts within the old kits have now been replaced by all-new plastic items.

When carefully assembled, the model will be able to function, either using the supplied operating wire and lever, or a servo system such as the Pecolectrics SmartSwitch.