Thanks for the replies.  I actually bought these from Marty and forgot to ask him about the parts/car diagrams.  This is the first set of williams rolling stock/passenger cars I have purchased so I did not know if they had diagrams and part lists.  thanks again for the help.

I recently picked up a 4 car set of Southern Pacific Daylight aluminum passenger cars at a show.  They all had original boxes but no diagram or parts list.  I do not know what year they were produced and I have not memorized the item number from the boxes yet.  Does anyone know where I can get a car diagrama nd parts list for these.  They look awesome hooked up to the GS-4 I got last Christmas.  Thanks

Kevin22,

I received the GS-4 last Christmas and really enjoy it.  It runs and runs the whistle sounds good.  The bell however sounds like a ball peen hammer hitting a steel beam.  It looks great and it's a heavy loco.  I have replaced the head lamp with an LED one and have added a flashing LED mars light to it.  I am also going to add some diodes between the power pick up and the motor to slow it down a bit so passenger car lights light up more.  The loco tends to run fast at lower voltage. 

I recently picked up some Williams Aluminum SP Passenger cars from a show and they look incredible with this loco.  Overall I give this loco 9 out of 10.