Yes - but that doesn't necessarily mean they were all piped up. Train classification was related to timing speeds. If a train didn't need to be piped up to satisfy the classification the shunters probably wouldn't bother doing so.
There have been reports over many years of sub-optimal behaviour when running on DCC with DC enabled on the decoder. Whether this is still true with modern chips and/or when stay-alives are fitted, I don't know. Since my locos never need to run on DC I always disable it. With JMRI DecoderPro it's a single click of the mouse.
Great film! In this still, for the first time, I see that while the tram running rails have been removed and/or tarmacked over, the conduit slot has not.
Shouldn't take long.
You need to get an AC supply as mentioned several times above.
Jaycar MP3021 will give you 16Vac but I'd suggest MP3032 which will give you 24Vac.
Jaycar don't seem to offer an (ON)-OFF-(ON) switch, which is surprising. Peco passing contact switches PL-26R are also suitable.
Good luck!