Help Me understand

No, you cannot do that.

 

You need a larger transformer.

Simply put, you need a more powerful transformer.
Using multiple transformers usually means using one transformer per loop. Or breaking up a loop into multiple blocks with one transformer per block.
In some situations you can parallel two transformers on one track but they need to be exactly the same voltage and exactly the same amperage. This is not recommended because the amount of current available can be dangerous in the event of a derailment.

Truthfully, I can't imagine why four Williams cars and a locomotive can't run with 100 watts, I think there's something else working here.

 

That is true - the action stops after a second command engine on the same track is in motion with about 8 freight cars.  I have run up to 3 engines on this 100 watt brick and might have a shut down if two smoke units were running.

Now running two engines, one pulling the passenger cars will shut things down.

 

Can two 100 watt bricks be plugged into a TIU and then both go to the track?????

I'm not a fan of parallel transformers.  If you do this, install a proper circuit breaker in the combined feed to the track.

zipper69,

It would be a wise thing to follow the advice given. The reason being, "Experience is a good teacher". It's amazing what many people do in attempts to cut corners. The only thing you are doing is taking chances. You could ruin your engines or your TIU or both. Worse yet, cause a fire and lose everything. 

The one thing I've learned in my many years. It is much better to have more power than you need. By doing so, you will avoid problems like these. I'm using three Lionel Z's & one MTH Z4K. All this and I need to add more. Play it safe and you will never be sorry.

Thank you all for your good advice and wisdom.

I'm thankful there is a forum to get sage advice from.

A big big help!

 

OK, there is a way to use both Transformers and not have issues with power.

However, a CW80 is the last transformer I would try to use with a MTH engine. They do not play well together.

 

Anyway, To get away with the mix, make short blocks in your layout. Power 2 separate DCS channels with your 2 transformers.

Connect one channel to every other block on the layout. then connect the remaining blocks to the second channel.

 

This splits the load across both transformers with bridging happening when your lighted passenger cross the breaks forming the blocks.

 

A partial solution to the bridging is to add a pair of diodes to each car between the pickups and the rest of the car.

This will reduce the current flow from channel to channel.

 

Point each diode the same way on a car. Both away from the trucks or both toward the trucks. Alternate the diode direction on every other car so you balance the load on the positive and negative sides of the sine wave.

 

This will also cause the lights to be running on half the power, so they will not get too hot or burn out as fast. But they will not be as bright, which actually looks better to me.