Transformer voltage options

Classic Toy Trains Forum
1

I know that there is a chart of various possible transformer output voltages for many transformers printed in at least the 1954 version of the manual which came with train sets. If anyone has it and they could post it here, I would very much appreciate it

As I recall, with an RW, you can connect a and u to track and get the high variable volt range. If you connect a to the running rails, and u to the center rail, then you can also use D for a high fix voltage. What happens if you connect the B and U combination with B going to the running rail? Do you get anything useful from the B to C combination? Does the chart show that?

2

The chart says:

With A as common, D is 19 volts, C is 9 volts, and U is 9 to 19 volts.

With B as common, D is 16 volts, C is 6 volts, and U is 6 to 16 volts.

With D as common, A is 19 volts, B is 16 volts, and C is 10 volts.

With U as common, A is 9 to 19 volts and B is 6 to 16 volts.

I find it easier to understand that the voltage from A to B is 3 volts, from B to C is 6 volts, and from C to D is 10 volts. U moves between C and D.

3

Thanks v much.

Is there any way to present the whole chart? I believe it covered Type V and type Z transformers as well as ZW, KW, Rw, 1033 and perhaps LW and TW, and maybe a few others.

4

Your looking for page # 536 in Greenberg’s Repair and Operating Manual for Lionel Trains. Seventh edition.

5

https://slsprr.net/technical/phasing.htm

Scroll to bottom of the page.

6

Wow. Thanks so very much for all the information and especially the following comment:

Some transformers have power taps that do Not use the common. If you use a power tap that doesn’t use the transformer common keep that wiring separate from all other wiring. See examples in the chart at the end of Phasing.

So looking At the back of an RW, what is the post at the lower left of the diagram used for, and with what other post do you use it?

7

It’s the C terminal. Lionel omitted it as a common on their chart, possibly because the variable voltage in that case is quite low. You can add to my list:

With C as common, A is 9 volts, B is 6 volts, D is 10 volts, and U is 0 to 10 volts.