Performance
The specification required that the locomotive should accelerate 315 ton (305 tonne) train from a stand to 30-mile-per-hour (48 km/h) in 30 seconds. According to Ahrons, "Holden's engine actually accelerated a new train of 18 carriages weighing 335 tons (340 tonnes) at a rate of 1.4 feet/second in very windy weather".
Axle load at 16.75 tons (17 tonnes), was not excessive, but weight per foot run of wheelbase was very high and using a class of these engines would have necessitated considerable strengthening of bridges; thus whilst it achieved its aims, nothing resulted from the experiment.
Read more about this topic: GER Class A55
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