Pelham Bay under the NH/NYW&B had 6 tracks with 3 movable spans. I don't have the link but Otto co-authored a book regarding the NYW&B and I believe it has a lot of info regarding the branch in it's heyday. I think they had a page supporting it so take a look there. Also there is a ton of info on the branch on the NHRHTA forums, with info provided by some of the operators who worked those bridges.
It boggled my mind when I saw how much used to be there, the amount of stations, yards, shops along that branch, and all with cat wire. It was a trip when I learned why they called the two tracks that came down to Fremont (by Fresh Pond) were called 5 and 6 Main, and that at one time SS 3/Bungay/Oak Tower had 8 main tracks going through it, 4 for the Hellgate, and 4 to go to the terminal at Harlem River. As Jeff mentioned on the Hellgate there's two for Penn (3 and 4 Main, or NH1 and NH2 when I worked Harold) and one for Fremont/Pond. Originally one of the freight tracks was cut back to a site of a derailment in the Conrail era ("swamp switch") and what was then Market Tower (took over for the closed Oak Tower), as there was no need for more than 1 track for the LI traffic. There had been a switching point in the very early period of the NY Connecting RR where the tracks split off going to Fremont or Penn (Bowery Bay), but after that closed it was just two to Penn. They block now from Pelham Bay to Gate, which was put in when they closed Market, and then Gate to Harold.
Two tracks is more than enough, even if they do put back some service via MN. Only time there was conflict when I did Harold was that Fast Mail train which was usually late and would show up in the midst of the LIRR rush hour. If PSCC could cross them at Gate it wasn't bad, but it was a pain if we had to cross them from NH 1 to Line 2 in the middle of the rush hour. They do plan to replace Pelham Bay as the bridge is old with a elevated row, and adding a third or more track wouldn't be worth the cost. If they do island platforms for the new stations and put in a new interlocking at old Market or at some point nearby, it would be easy to run around a local.