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 here is an example, of how boiler and smokeboxes grew. Though the angle of the photo is twisted, the back of the caps is in one line - Bullmoose, Y3a, 9000, Heavy. Chall., BB:<img src="http://img59.imageshack.us/img59/1493/dscf0018lp.jpg" mce_src="http://img59.imageshack.us/img59/1493/dscf0018lp.jpg"> Actually, the early 3900class is missing here, the boiler and firebox-length of the late3900 class Challenger grew in length a portion in comp. with a 9000, the Y3a has a longer boiler and bigger firebox than the Bull Moose, but has shorter smoke box -hope, you enjoy!lars
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