The Other Railway diesels are five diesels that appear in the Railway Series stories "Bluebells of England" and "Escape".
The first three
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The first three appear in the fourth illustration of "Bluebells of England" looking at Stepney. The first one was coloured green and cream, and had a yellow face. The second was brown, and the last was coloured green all over.
The last two
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The last two appeared in the fourth illustration of "Escape" by a signalbox near the quarry branch where Oliver hid. One was a blue diesel very similiar in shape to Boco, while only the face of the second one was seen; it was covered in yellow and black "hazard" stripes.