Modern engine with post-war transformer et al

The KW will run any set from 1915-on except the new LionChief sets(it will run LionChief +). The few DC-only sets, very low-end items, are the only other exception.

You should get a newer transformer or add fast acting circuit breakers and a transient voltage suppressor unit(TVS) to the output side of your KW for newer Lionel engines.

Lee Fritz

I am in the same boat as you, old O27 guage stuff that slowed to a stop over three weeks time and needs rebuilding. I purchased a lionchief set to have somethin to run.  Email me and i can send pics n video if you are interested in seeing it.  It may help you make a decision.  Ted

1. As ADCX Rob posted, that KW is fine for old and new trains. It produces "pure" or "full" sine wave AC current. No "filter" is necessary. As PHILLYREADING posted, a fast-acting fuse and a TVS between the transformer and the track will protect electronics in current locomotives. This goes for all  transformers.

The one drawback is that a KW (like other postwar transformers) has no Bell button that sends negative DC to the track to ring the bell and access some features. A modern transformer is the easiest solution.

2. Williams and Williams by Bachmann locomotives are designed and built for conventional (transformer-controlled) operation. They are as simple and durable as anvils. Lots of used Williams is available.

3. A KW can power a good-sized layout. If any switches seem to lack power, run fixed voltage to them.

Good Luck! Give our best wishes to your son. Keep us posted, y'hear?

Here's a link to the part numbers for the most often used TVS diodes and where to get them.

Is there a concise set of instructions on how to wire this stuff up?

Another option is to keep your KW and add Lionel Powermasters. I believe (but would defer to Rob for confirmation) that they provide the fuse AND protect modern engines from transient voltage. Plus, they give you the ability to control the track voltage from a handheld remote control unit called a CAB-1. I use this approach for my conventional engines.