Lionel LionChief DC power supplies - parallel?

Yes possible but caution, only with the original DC Lionchief supplies and track sections. Because they are DC and polarity is pretty much ensured, as well as the fact they have decent current limit sensing and shut down in a fault.

FWIW, when I got back into the hobby in December of 2017 and bought a few Lionchief sets, my carpet track was powered this way. However, I quickly moved on to proper power distribution and AC to run anything but Lionchief engines.

Also note, there are many Lionel cars and accessories- as well as engines that are AC only and can be damaged by DC. Check the manuals of cars and items as you buy them.

When using a transformer with AC, best to have a single power source and use distribution blocks and wiring to feed sections.

Thanks Vernon.

Yes, these are both DC Lionchief wall packs and track sections.  I work in electronics and paralleling is common there, just wanted to make sure this was "do-able" with my trains.

Connected up and it's running smoothly with parallel DC wall power packs.

I also started with some DC wall packs for my carpet layout. They worked ok for just running a single train however Fasttrack switches were somewhat unreliable so it wasn't long before I invested in the 180watt brick.   Once that was connected it was no problem running multiple trains and all the switches were suddenly reliable. 

Took the cheap route, so my switches are all manual.  So haven't ran into that problem, but it would be expected.   My stuff came together as Pennsylvania Flyer set that I added extra track and a pair of switches.  Then pick up a Christmas Express set at a super low price.  More track and some more switches and I can do a pretty big layout.  Could run the two trains off a single wall pack without problem.  Most setups I put together were about 8-10 feet by 10-12 feet.

The one giving me problems was loop in the living room and a run down the hall to a turn around in a bedroom, so about 50-60 feet of track that has slight drop from carpet to tile at 6 places.  Those floor transition seem to cause intermittent connection that depend on the position and weight of the train.   Adding a second power source on the other side of the majority of the floor transitions worked wonders to keep power to the travelling trains.  Will also do a thorough cleaning of the track sections when I take this one down.  Carbon build up on the tracks may be where a bit of my current problems came from.

The 180 watt power brick might be in the future.  Just talking, each wall power pack is 3 Amps (54 watts), so two gets me 6 amps/108 watts compared to 10 amps/180 watts of the brick.  Since I only running two trains and no accessories, I'm good for now.