MTH also has a 10-pin female to 10-pin female (one end has a 90-degree angle that plugs into the engine/the other end is straight). It is for a 3V PS2 board. Part number: BC-0000217. Price (as of the end of February 2012): $10 plus shipping to your location.
For further information -- or to find the precise tether that you need:
email Midge Wilburn at MTH: midge@mth-railking.com