Curious question as a what if the Manhattan Els (2nd, 3rd, 6th, and 9th) haven't been torn down, still standing today (same stations and tracks), and have seen the real events that took place in NYC. Make sure you depict service too.
Examples to get you started:
(8) <8>-3rd Avenue Elevated
(12) <12>-2nd Avenue Elevated
(14) <14>-9th Avenue Elevated
(16) <16>-6th Avenue Elevated