On Wednesday, November 2, 2016 at 11:47:44 PM UTC-4, John Albert wrote:
> Cab signals and speed control (until the Metro-North
> accident) applied ONLY to signal indications (i.e., would
> apply brakes if engineman did not take appropriate action
> after passing a more restrictive signal indication).
>
> After the Spyten Duyvil wreck, Metro-North installed cab
> signal "drops" approaching certain speed restrictions. These
> operate independently of signal indications.

However, it sounds to be relatively trivial to install a slower
signal at a serious speed restriction to force a slowdown, as
MetroNorth did.  Simply change the most permissive aspect on
a signal from proceed to a slower speed.

It also seems rather simple to add on more aspects than the 1951
technology; I think its fastest was 45 mph for approach limited.

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