. Electric railway journal . trains, which in the three tests run weighed 198 tons,245 tons and 246 tons, exclusive of the locomotive. Thesetests showed (1) a rapid and constant rate of accelerationand (2) a ratio between the mechanical power applied atthe peripheries of the wheels and the high-tension power, atfull speed, of from 78 per cent to 80 per cent. The report says further that operation of the permuta-tors, when tested at the shops of the manufacturers as re-gards efficiency and commutation, had proved satisfactory,but that there was some question as to whether they andthe synchronou
. Electric railway journal . trains, which in the three tests run weighed 198 tons,245 tons and 246 tons, exclusive of the locomotive. Thesetests showed (1) a rapid and constant rate of accelerationand (2) a ratio between the mechanical power applied atthe peripheries of the wheels and the high-tension power, atfull speed, of from 78 per cent to 80 per cent. The report says further that operation of the permuta-tors, when tested at the shops of the manufacturers as re-gards efficiency and commutation, had proved satisfactory,but that there was some question as to whether they andthe synchronous motors would give equally good resultswhen subject to frequent fluctuations in frequency and volt-age. No trouble, however, was found. This may in parthave been due to the use of very powerful damping devicesconnected electrically between the armatures of the twosynchronous motors, so that if there was any hunting it wassynchronous and did not disturb the operation. It was also found that considerable tractive effort could. P. L. M. Locomotive—New Type with Single Motor and Connecting Rods Hence the motorman, by regulating the current in the finewire coil, controls the current in the driving motors. Thissystem of control permits a smooth acceleration, becausethe tractive effort is kept constant during the whole periodof acceleration. It also has the advantage of automaticallylimiting the load on the driving motors. The exciting circuits of these pilot motors in the twohalf-units of each locomotive are in series, so that theymove in synchronism and provide multiple-unit operation ofthe two half-units. REVERSING There is a reversing switch on each half-unit. Theseswitches are operated by compressed air and are intercon-nected so that they can be operated from either cab. Theyare also interlocked mechanically with the apparatus forvarying the angle of displacement on the permutators, sothat it is impossible to reverse the locomotive until thebrushes are brought back to the pos
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