Why did it end-Do you mean why did it end without replacing the last R32s and R42s? The answer could technically be that they ran out of R160s to replace old cars with
. BUT, assuming my assumption was correct, here's the answer:
The brand new R160s were being delivered to replace the old 60s subway cars (R32/R38/R40/R42). However, it was noticed that the R44s had structural issues that required a swift retirement. So, the decision was made to dispose of the remaining R44s with the R160s that were being delivered. As a result, there are a little over 200 or so R32s and 50 R42s left. They remain in service to this day because the MTA couldn't get R179s on property until 2016 (See above), if that year actually stays (Delays, etc.)
When did it end: 2009??? The R38s and R40s left in 2009 so I assume that they were all reefed in 2009 or 2010. The R44s left in 2010 but aren't there photos of R44s being trucked away as late as 2012/2013? (Note that the R44s were scrapped versus reefed).
Someone else could give you a definite answer. If need be, check the photo database at http://www.nycsubway.org
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MTA project completion date calculator Take the MTA 's estimate for completion and add 8 years to that.