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"Standards were also the first New York City Subway equipment to experiment with cab signaling. The underlying rationale for the experiment was to allow trains to run safely at closer headways to provide more frequent service. An attempt was made in 1916 to test a GRS cab signal system using Standards. While generally working as intended, the experiment did not have staying power. The equipment necessary for its use was removed by 1918. It was not until the 1990s that a similar idea would be revisited in the subway, when MTA New York City Transit installed modern CBTC signal equipment on the BMT Canarsie Line.
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