I think that one would say that this design does have an engine bustle
- in the sense that the engine is enclosed in a separate area that
protrudes from the bodywork. The type without a bustle is typified by
the ECW style on Bristol VR chassis, in which the area immediately
above the engine is enclosed within the bodywork, and the rear face is
essentially flat.
I don't know about these East Lancs bodied vehicles, but the ex-West
Midlands MCW bodied vehicles, mentioned earlier, were rather unusual
in that (as far as I can remember) the upper deck extended rearwards
slightly further than the engine bustle.
Nigel
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