Sw and tw

[stuartmit]

Believe I have seen comments that sw and tw are actually two transformers in one case.  What are implications of that as compared to a Kw? 

[Flintlock76]

Here's some good scoop on post-war transformers.  It should tell you what you want to know.

https://www.tandem-associates.com/lionel/lioneltransformers.htm

[ADCX Rob]

stuartmit

Believe I have seen comments that sw and tw are actually two transformers in one case.

Those comments would be in partial error, the SW is constructed very similarly to the KW, sharing one core for both throttles, but with whistle control only for the "A" throttle. All of the SW's power(130 watts input) is available from either throttle as needed... about 6 amps continuous.

The TW can only provide half of its power(175 watts input) to the one throttle handle... about 4-5 amps continuous.

The KW, shares one core for both throttles, with whistle control for the "A" & "B" throttles. All of the KW's power(190 watts input) is available from either throttle as needed... about 10 amps continuous.

[stuartmit]

Oh yes.  I see a close look at online photos reveals one control on TW is marked for whistle and direction. So not what I want.  SW is different even it looks similar to me. So thanks all.  

[Flintlock76]

stuartmit

Oh yes.  I see a close look at online photos reveals one control on TW is marked for whistle and direction. So not what I want.  SW is different even it looks similar to me. So thanks all.  

 

I took a look at the SW myself and I can't help but wonder.  Did the "Star Trek" producers back in the 1960's get the idea for the "Starship Enterprise" and later "Starfleet" insignia from that Lionel transformer?  The time frame's right.  

Makes one wonder...

https://www.tandem-associates.com/lionel/lionel_trains_sw_transformer.htm

Here's more than you'd ever want to know about the "Star Trek" emblem.

https://www.startrek.com/article/starfleet-insignia-explained

 

[Leverettrailfan]

I have a TW, it's a very handy transformer if you want to run a single train and some accessories. It's extremely convenient having all the different accessory outputs! Maybe not the most practical for a large layout but it's an interesting piece of equipment to have and can prove itself useful.

-Ellie

[stuartmit]

I have seen the instruction sheets for the TW which do specify in the verbiage, that the unit should only be counted on for 130 watts. And given the unusual dual core construction used, the throttle for track power, it will probbaly not deliver enough power for two locos, or certainly not two dual motored post war units like 2343s. I am sorry that the output wattage is not easier to locate in the marketing materials; probably the input wattage is required to allow a user to calculate house circuit load to eliminate blown circuits or fire risk. But reading the forum can provide additional info to help avoid surprises. 

[ADCX Rob]

stuartmit

...probably the input wattage is required to allow a user to calculate house circuit load to eliminate blown circuits or fire risk.

A 15 amp household circuit can handle 9 TW's fully loaded easily, 10+ under normal operating conditions.