I think Redsy is talking about a 14-2 set of travelers going to a 4 way from 3 way #1, & a 14-2 set of travelers leaving the 4 way going to 3 way #2. This is no different than the 2 wire travelers between the 3 way switches.
Mountainman, 404.2 referrs to switch loops only... not travelers. Respectfully,
Rick