on Fri May 18 14:50:30 2012, in response to Re: Dyre Avenue IRT anniversary, posted by Chris R16/R2730 on Fri May 18 13:19:14 2012.
AFAIK, the specific legislation prohibiting expansion outside the city had nothing to do with LaGuardia, but was merely the way the legislation that allowed city takeover of the transit system was drafted. That was the same reason that in the early years of the city operation of the Dyre Line, it was part of the IND even though it used IRT el cars and Hagstrom maps showed it as an IRT line. At the time, all new (and the Dyre line for legal purposes was a "new" line) rapid transit lines had to be IND lines. After the NYCTA replaced the B of T in 1953, certain aspects of the administration of the NYCTS changed and the Dyre Line was able to be made a part of the IRT Division. That's also the reason that the tracks on the Dyre Line were numbered using the BMT/IND scheme instead of the IRT scheme.