Instead , both the railing and the walking layer of Gyalpo 's bridges used wires .
Gyalpo 's iron chain bridges did not include a suspended deck bridge which is the standard on all modern suspension bridges today .
Both the railing and the walking layer of Gyalpo 's bridges used wires .
Gyalpo 's iron chain bridges did not include a suspended deck bridge which is the standard on all modern suspension bridges today .