But a single horse could pull a barge weighing over 30 tons .
A horse could pull at most one ton of freight on a Macadam road , which was multi-layer stone covered and crowned , with side drainage .
A single horse could pull a barge weighing over 30 tons .
A horse could pull at most one ton of freight on a Macadam road , which was multi-layer stone covered and crowned , with side drainage .