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| Re: (interlocking) TA is obsessed with CBTC, and ''New'' tech for no reason. (580682) | |||
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Re: (interlocking) TA is obsessed with CBTC, and ''New'' tech for no reason. |
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Posted by randyo on Tue Mar 4 18:26:36 2008, in response to Re: (interlocking) TA is obsessed with CBTC, and ''New'' tech for no reason., posted by Jeff H. on Mon Mar 3 19:36:13 2008. The original BMT model 2s did not have a time release when a train was on the approach circuit. Instead when the train was on the approach, in order to fully normal the signal lever, the Tw/M would have to operate a small hand crank numbered for the associated signal lever on a box mounted on either the top or the side of the machine. After the crank had been turned a sufficient number of times, the signal would be able to be placed in the fully normal position. After the necessary switch movement was made, even though the signal lever was cleared, the signal in the field would not clear until the crank was restored to its original position. This device was referred to as a "screw release" not to be confused with the emergency screw release on model 5 and modified model 2s which ws used to throw a switch in the event of a track circuit failure. Some signals on the early model 2s did have a time release device on the lever itself but this was in effect all the time whether there was a train on the approach circuit or not and was usually on reverse dwarf signals or other signals used for reverse or other irregular moves. |
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