A braced framework for carrying a railroad over a chasm
... 
chasm, roadway, or railroad) carrying a continuous pathway or roadway (as for 
pedestrians,... [DOC] [TLE] Region 7 - Russ Nelson's Home Page [PAR] GLOSSARY BALLAST - Crushed rock or gravel, used in railroad beds to provide 
... TRESTLE - A braced framework of timbers, piles or stoelwork for carrying a 
railroad over a ... 7 - 37 Keeseville - Ausable Chasm & Lake Champlain |^~R.