Just as a reminder, here's the evolution of 'Ross Run', the logging module, that links up to the Hickory Valley Railroad. These two modules are both small enough I carry them around like big suitcases. The HVRR is only 18x36" This logging module is a shade bigger because I didn't want to stress the Atlas Shay out with tighter than 9" radius any more. Note that the 'uphill' switchback is designed so you watch the gears, always, from the right hand side pushing uphill. So this one came out to be 21"x42". Since I had the mill on the HVRR module, this is self-contained to go between the log landing (upper switchback) to the log pond (lower level). Original paper plan: I added a three-track storage yard under it, along with a full reverse loop for any future module. Several of the hard-shell sections lift out for maintenance of that hidden yard. A 'few' years later, here's where I'm at: Basic scenery is in, track now painted, bridges and wood structures in like the log dump, log pond and creek bottom painted. This was down at Altoona this year, hitched up to the Hickory Valley (which is basically a stacked loop-to-loop with 8" curves) At 21x42", this is about as big as you want to go and have it one-box portable. It's a bear to carry up and down stairs by yourself and was the reason that subsequent modules were done to T-trak standards of 14X34" (more or less). Point of all this is to prove just how small you can go in N and have a viable logging railroad. The way this is designed each module also connects on the lower level to make a continuous loop, although in practice I've never used it much. But you can NEVER have too much storage track, as long as you can figure out a way to get to it, and I designed 'off layout' connections that may or may not ever get used, but I'm sure glad I designed the original HVRR that way back in 1976.