4-8-0 M-2 class

[nw-mailing-list at nwhs.org]

Hi,
 I have a question about the cylinders on some 4-8-0 M-2 class locos, the 1150-1160 numbers. On the cylinders of some, there is a protrusion off the side of the middle of the cylinder, with square ends. This is on at least #'s 1153, 1148, 1119 and 1112 that I know of. Is this a 'street stoker'? If so, or not, what is that? Also, I would like to see if I can model that on a brass 4-8-0 I am getting, any body done this conversion?
Thanks to all in advance.
Tony Burgess

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