[Tagging] Feature Proposal - RFC - 3rd and 4th rail

[Garry Keenor]

https://wiki.openstreetmap.org/wiki/Proposed_features/3rd_and_4th_rail

Definition: A track electrified with a 4th rail system, with two additional
rails on insulators and two shoe pickup by the train, and traction current
returning via one of the insulated rails

best regards,

Garry
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