The signals are covered with black bags, it looks like.
Searching for the eagles of the XVII,XVIII & XIX Legions in Germania.
Railroad Forums
Signals on NYA's Lower Montauk line
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That signal has been there for at least 2-3 years. It was when the G-heads first stared invading Harold and F. Speaking of which, the G-Head signals at the east end of the Hunterspoint station have been there almost the same amount of time and are still bagged up.