TW Transformer power loss

The TW is listed as rated at 175 watts "designed specifically for use with one-train layouts having a Considerable quantity of auxiliary equipment."

Yours is either of these two:

TW 1953

or   TW  1954

You will probably want to add another transformer.

The TW is an odd duck, it actually has two transformer cores.  The track power comes from a 75-80 watt core, and the accessory from a similar core.  Since these are rated on input power, you'd be lucky to have 60 watts of output power to actually run the train, probably not enough power for many consists.  I agree with Susan, you probably need a better transformer.

Well, the accessory core has basically the same capacity, and it's not variable, so I'm not sure that's practical.

are you attached to the U &A posts? Since this transformer is an odd duck the U post wire goes to the center rail. I don't know if this will help but update us when you can.     Lenny

For the record:  Under the tree on Xmas morning 1957, I found a Super-O set with a N&W 746 Northern and a TW.   There was plenty of power, and there still is.  I suspect you are right that you have a weak core. Try measuring the voltage drop of both cores across a constant load and see if they differ significantly.

I feel so stupid.  I always used the first two terminals on my transformers, and when I read the back of this TW, 18 volts which is the current was next to the C and U.  My bad, thanks for the help though.   

page 43 of the 1954 Operator's manual

Since your running PW equipment, you might enjoy this.

I had a TW for a couple years.  It worked with a conventional 4-4-2 and accesory lighting.  Make sure and pick up a voltage meter and a set of alligator clip leads.  It really helps When these things happen.  Glad to hear you found the issue.