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| Re: Arnines on the BMT - photos - early years (1522504) | |||
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Re: Arnines on the BMT - photos - early years |
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Posted by randyo on Tue Aug 27 17:42:46 2019, in response to Re: Arnines on the BMT - photos - early years, posted by italianguyinsi on Tue Aug 27 14:24:04 2019. As originally built, the electric portions on the BMT steels drawheads were actually a slide that had to be advanced from one car to the next by a position on the uncoupling valve in the M/M's cab in order to establish electrical connections which is why many old time BMT crews used to refer to all electric potions generically as “slides.” By the time of the D types and SIRT cars a automatic electric portion had been developed in which upon coupling, both electric potions advanced and met each other face to face. The original slide on one end of the 2390-91-92 unit has been replaced by a regular electric portion that allows it to couple to either an R-9 or a D type. Since there may have been a few BMT style drawheads left over from the steels that were unitized into B units it’s remotely possible that the TA could have installed them on the SIRT cars to make them compatible with the steels but either there may not have been enough parts to do it or the TA might have felt that it wasn't worth the effort for such a small fleet. There were other mini=or differences between the SIRT cars and the steels that would also have presented some difficulties. The MU door controls were not wired into the slides in the steels which is why an additional 9 point door jumper had to be added when they were retrofitted with MUDC in the 1920s. Also, the steels had tripcocks that could be reset from the M/M’s cab since they were electric in nature whereas the SIRT cars had to be retrofitted with a straight mechanical tripcock that had to be manually reset under the car in the event of a tripping. To retrofit the SIRT cars with such a device would require installing a completely new circuit which was probably not worth the expense. |
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