What is the max amount of postwar cars vs modern cars my Lionel 726 rr be able to safely pull without burning out the pullmor motor?

I have bought a cab 1 remote  a 180w powermaster, a command base 1 and have a bunch of postwar engines but now looking to find a Modern tmcc equipped diesel. I am willing to trade some of my engines for a tmcc diesel.
 A black 221 with whistle tender. New York central is faded but readable.
A 224 with black handrails and a 2466W tender.
A Lionel Southern Pacific Gp20 Diesel Engine 18831 with box. I bought this accidentally thinking it had tmcc but it doesn’t.
Two prewar maroon 607 Macy special passenger cars. Macy special is legible on one side on each car.

If you have a tmcc equipped diesel that you are willing to part with and interested in trading, email me at Gameboy1527@proton.me

I have been running my 624 and when it was working, two things I noticed during operation was the eunit would sometimes cycle at random, and the pickup rollers would sometimes get hot after running it for hours. A week ago I was getting my 624 back on the track and the engine started making a faint weird noise, the 2 lights wouldn’t shine, the engine wouldn’t run and a lot of sparks flew when I tried moving the engine with my hand. Then the transformer started tripping. I lowered the voltage all the way down and checked to make sure all the wheels were in place and they were, I flipped the engine over and the pickup rollers were really hot! I put the engine back on the track making sure all the wheels were on the track correctly and applied power and got more of the same. I took the shell off and took the pulmor motor off and took two leads from the transformer to the two brushes on the motor and it made a loud hum, but wouldn’t move. I removed the old grease and lubed the motor truck and the motor hole and tried again this time the motor moved a little bit but was pushing up still humming loud. Is it possible I have a bad motor? Or could the short be from the e unit or the pickup rollers? All the original wiring appears to be good and the  solder joints are tough.

So I recently decided to try out O scale for my newest layout ,( all previous layouts have been HO scale) I'm using all lionel post war track and accessories.  I'm having problems with where I should put the insulator pins on my turnouts.  I have about 12 turnouts on the entire layout and can't find any YouTube videos that address the exact issue in facing.  I have a couple spots on the layout where I hav two turnouts back to back facing opposite directions and im not sure where to put the pins on the two. Any help would be greatly appreciated

Hi, I recently acquired my dad's old lionel train set, he passed a few years ago and this set was up in the attic. It will be a week or so before I can unpack it all (I'm traveling) but I did pull out a 1936 catalog and some instructions. Also a transformer. Any info. is appreciated! I'm at level zero here!
* I can't seem to reduce pic size enough for this site to accept them, I reduced to 20% twice and they are still too large.