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For passenger trains and occasionally for fast goods trains screw couplings are substituted for the simple chains.
Among the city's manufactures are boilers, machines, glass, chemicals, terra cotta, brick, iron pipes and couplings, gas engines, cutlery and silk.
Each span has four steel double ribs of steel tubes butted and clasped by wrought iron couplings.
Let ai, a2, af be the angular velocities of the first, intermediate, and last shaft in this train of two Hookes couplings.
Hydraulic couplings operate as clutches, but without the wear problems encountered with friction clutches.