. Electric railway journal . NORFOLK & WESTERN LOCOMOTIVES—VIEWS OF MOTOR ROTOR OR SECONDARY, TRUCK AND MOTOR HOUSING AND WOUND MOTOR STATOR OR PRIMARY April 1, 1916] ELECTRIC RAILWAY JOURNAL 645. NORFOLK & WESTERN LOCOMO-TIVES—MAIN MOTORBEARINGS the windings against the injurious effects of depositsof coal dust, both rotor and stator are dipped in varnishand then baked, a process which very materiallystrengthens the insulation against voltage strains dueto creepage. This is an important precaution because,as the locomotives operate in the coal fields, the pushinglocomotive is frequently envel
. Electric railway journal . NORFOLK & WESTERN LOCOMOTIVES—VIEWS OF MOTOR ROTOR OR SECONDARY, TRUCK AND MOTOR HOUSING AND WOUND MOTOR STATOR OR PRIMARY April 1, 1916] ELECTRIC RAILWAY JOURNAL 645. NORFOLK & WESTERN LOCOMO-TIVES—MAIN MOTORBEARINGS the windings against the injurious effects of depositsof coal dust, both rotor and stator are dipped in varnishand then baked, a process which very materiallystrengthens the insulation against voltage strains dueto creepage. This is an important precaution because,as the locomotives operate in the coal fields, the pushinglocomotive is frequently enveloped in clouds of dustfrom the tops of the cars, some of which is carried intothe air ducts and deposited in the windings. By means of longitudinal ducts in both rotor andstator, forced air is taken in at one end and exhaustedat the other. With this method of ventilation thereare no sharp corners such as occur with radial ventila-tion. The ventilating air is secured from a blowermounted on the shaft of the phase converter. The Phase Converter To facilitate locomotive overhaul the phase converteris also designed to provide for vertical lifts. The phaseconverter, starting motor and blo
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