Rail King D&RG 4-6-0 Operating Instructions Manual page 35

WARNING:
When using electrical products, basic safety precautions should be
followed including the following:
-- Read this and all related manuals (transformer/power supply,
locomotive, etc.) thoroughly before using this device.
-- This device is not recommended for children under ten years of age
without adult supervision.
-- MTH recommends parents examine the toy transformer used to power
this device periodically for conditions that may result in the risk of fire,
electric shock, or injury to persons, such as damage to the primary or output
cord, plug blades, housing or other parts (including proper functioning of
the circuit breaker), and that, in an event such conditions exist, the
transformer should not be used until properly repaired.
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RailKing D&RG 4-6-0 Operating Manual