Hi  --D
I plan to re-power with a newer motor that should alleviate the current draw problem.
I also found the proper connector at WWW.DCCINSTALLSANDSALES.COM

I think I have found what I need at:
www.tcsdcc.com
appreciate the help.

Thank you Don and Jim.
Let me expand a bit.
The F7A is probably 30+ years old. It is part of a 5 car UP Daylight train which is the Jr. Eng.'s favourite and runs really well.
I converted it to DCC and now want to add sound.
The stall current of the motor is 2 Amps and I cannot find a chip that will handle that current.
I have located a replacement motor but, with the weights, there is not much room in the A unit - hence wanting to install the electronics in the B unit. Since the power pickup is in the A unit I will need to connect the power from and the control to the A unit.
I will look at Radio Shack for miniature connectors - thanks for the suggestion!

I have an older F7A that I am about to re-power.
I would like to place a Sound Decoder and speaker(s) in the 'B' unit.
Where can I find a set of connectors to join the two units.
I converted a Spectrum loco to DCC and there were two connectors between loco and tender = I need something similar - any ideas?  Thank you.

CNE "How about a model of the narrow gauge railway that ran the length of Bermuda? "
The Bermuda railway was standard gauge and was sold to British Guiana (now Guiana) over 60 years ago. Only Narrow Gauge was a very short line owned by Vincent Astor. Out of service for many years.

Thank you gentlemen,  really helpful information!

between 30 and 45 MPH.

How do I compute the angle to 'bank' a track with a radius of 22 inches and a 2% grade?

Thanks Jim
I had a feeling that there may be thoughts out there

Interesting discussion.
Any ideas extending the turntable to swing a 15 inch loco with tender?

OK Jim,
No problem reading any files.
The link would not take me to another page -- just kept time-out.
This morning I tried two and they did work.
Cheers!!

Thanks again Jim,
Great story!
I had tried to get the info from the Digitrax page but the links would not work for me.
I have printed the manual and will have a read.
We have room for 1 1/2 sheets of ply so one UT4 will be perfect.....

This is certainly NOT a static hobby:-)
Solve one problem and there is another waiting down the track.
We now need to access the Functions above F8.
Is a UT4 /UR90 combo needed to accomplish this or is there a simpler way?
How does a UT4 get F0-F12 with only six buttons?
Thanks...

Thanks Jim,
Each day things get a bit clearer - particularly with your help!
Once I realized that I need to use Direct in Blast mode it worked first time.
Have a great weekend!!

Success at last!
I discovered that Direct must be used to programme Loco number in Blast mode.
Now to find Fireman Fred..........