The term 'Subway Support' can be broken down into four crossword solutions: RAIL (4 letters), STRAP (5 letters), RAILS (5 letters), and TRACK (5 letters). RAIL is a noun that refers to a bar of metal, wood, or other material used to form a TRACK along which a train or other vehicle can travel. STRAP is a noun that refers to a long, narrow strip of material used to hold something in place or to fasten two things together. RAILS are two parallel bars of metal, wood, or other material used to form a TRACK along which a train or other vehicle can travel. TRACK is a noun that refers to a prepared course or route for a vehicle, person, or animal to follow. Together, these four words describe the components of a subway system that provide support for the trains.