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Old 21-12-2017, 08:09 PM   #1
brian1951
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Default Class 121 / 122 confusion

Why did they put 122 on the front of 121 railcars ? Picture is a Class 121 RN 55022 , which has 122 on the front. IMG_4716.JPG

IMG_4718.JPG
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Old 22-12-2017, 12:32 PM   #2
Mountain Goat
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I dont know the difference between them. It could be the power rating of the engine like the class 158 and 159, or it could have something to do with which other units they are compatible to couple up to, which would have likely changed later in life when certain DMU classes are no longer in use. Often minor differences were changed to comply with a main class. Years ago the practice being to class one version of the same loco into a different class which later they numbered them as the same class but added sub classes.
I may not have directly answered your question here so I apologise, but I thought I'd say something as no one else seems to have answered so I guess they dont know either.

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Old 22-12-2017, 12:35 PM   #3
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I have just had a member call to collect some locos, and he has provided the answer. He will hopefully post it on here later.
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Old 22-12-2017, 05:24 PM   #4
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A useful book to own in this context is 'Traction Recognition' by Colin J. Marsden.
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Old 22-12-2017, 10:13 PM   #5
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As indicated above the numbering indicates set 122 not that its a member of Class 122. Hornby did blunder on one release which was issued in a livery that was only carried by a 122.
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