Not only a good idea, it's been done for quite a while... Craig Tice's Mojave & Panamint R.R., as featured in the Feb '93 Railroad Model Craftsman did that:
(!empty($user->lang['QUOTE'])) ? $user->lang['QUOTE'] : ucwords(strtolower(str_replace('_', ' ', 'QUOTE'))):
"The M&P features code 40 track that is entirely handlaid. Most ties were individually cut from stripwood, with every fourth or fifth tie being Clover printed circuit board to which the rail is soldered. The PC foil is slit in the middle to provide electrical isolation between the two rails."
http://home.att.net/~craig.w.tice/rmc/Index.html
http://home.att.net/~craig.w.tice/mprr/Index.html
With code 40, it makes sense, since most spikes would start to interfere with flangeways, but even for larger rail it would make sense. I personally never liked fussing with spiking (and respiking!) every inch of my right o' way, so for me anyway, this is the way to go.
- T