Problems
The class were troubled by several reliability problems, notably with the engines which were found to require excessive maintenance. A series of modifications to the pistons, piston rings and maintenance schedules, and fitting cast iron cylinder heads improved the engine reliability considerably, but a complex V16 for only 800bhp and a small class size doomed them with a contracting rail network. The layout, with a single cab positioned part-way down the body like a North American road-switcher, gave the crew poor forward visibility in both directions of travel, although this was initially tolerated as it was no worse than the visibility from a steam locomotive cab. Despite these problems the class were more successful than the contemporary Type 1 locomotives of Class 16 and the later Class 17.
Read more about this topic: British Rail Class 15
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