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Lumec Heilos
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These replaced remote ballasted mercury Powerlite gumballs in 2006. The mercury gumballs were orignal to the Yonge Line opening in 1954. I believe in 1954 they were incandescent so they probably added in the remote ballasts during a later merc conversion.
These light the main line along with the rest of the subway train yard.
H-4 work cars along with more Lumecs mounted on the existing poles. The yard itself used to be lit by 1kW merc floods on 70' tall poles.
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I've seen the stumps of the old gumball poles before but I don't see them in this pic lol. Maybe I should get a pic of the stumps.