You can of course set the bridge up on small wooden blocks if you wish to raise it slightly higher but my design was for a narrow country lane/rural bridge sort of style.
OO Gauge Double Track Iron Girder Bridge Model Railway Train Layout 1:76 Scale
Metcalfe PO313 OO Gauge Double Track Engine Shed Card Kit
Hornby R164 OO Gauge Double Track Tunnel Portals Set of 2
OO Gauge Double Track Spacer – 2″ (51mm) | Pack of 3
OO Gauge Double Track Spacer – 2⅝″ (67mm) | Pack of 3
OO Gauge Double Track Spacer – 2½″ (62.5mm) | Pack of 3