Sorry for the lateness with a follow-up ... life got busy for a while.
Here are two pictures ... showing the box I was telling you about. The 'inside' dimensions are ... 4 inches wide ... 2 5/8 inches deep ... 14 1/2 inches wide. If it is more than a bit tight ... you can take the 'wheel sets' off and store them at either end. Now it was not a problem at all with my 9v trains ... I now am converting ... and noticed one small problem ... 9v was a piece of cake ... you just pop off motor and wheel sets ... now ... with PF system ... your wheel set is physically attached via the power cord ... that might make it tricky in the future. Below are two pictures of the box I was telling you about ...
LEE