The man was taken to hospital after being injured with a machete, police say.
The bridge is being installed near Ravensthorpe as part of the Transpennine Route Upgrade.
The West Yorkshire station will be closed from 14 December until March 2028, says Network Rail.
Ravensthorpe railway station will be demolished and a new station built nearby, the DfT says.
Kirklees Council has brought in orders to ban begging, bird feeding and loitering.
Kirklees Council is set to lift measures in three areas, amid recorded improvements in air quality.
Defra says an outbreak was discovered at a premises in Ravensthorpe near Mirfield.
More than 1,700 plants have been found in four raids across Dewsbury in recent weeks, police say.
Police discover more than 1,500 cannabis plants at a disused commercial building in Dewsbury.
