Re: B&O M-15 underframe
Earl, Standard Steel Drawing 38048 is the partial under frame drawing and is available at the IRM library.toggle quoted messageShow quoted text
You are correct with the truck enter dimensions; the center sill is 28',the side sill is a 9" pressed Z shaped; end sill is a 10" 15# C channel offset 1 3/4" above the side sill; there are three cross ties and two cross bearers. Spacing between cross members is 64" plus a fraction, and a shorter length between the last cross tie and the bolster.
The brake rigging is Very atypical; there'a a brake badge published in the PRMV4, and there are steel detail drawings of brake dead lever mounting parts at Harrisburg ; I was unable to find a complete brake arrgt, although I believe the IRM should have it.
From: Nelson Moyer npmoyer@... [STMFC]
Sent: Mon, Nov 13, 2017 11:53 am
Subject: RE: [STMFC] B&O M-15 underframe
Earl, there is a comprehensive article on the M-15k rebuild by George Toman in Prototype Railroad Modeling Volume 4 p.53-68, with both prototype and modeling photos including the underbody details. The book is available from Speedwitch Media. While the article doesn’t answer all of your questions, it shows you how to build a very accurate model of the M-15k.
Can anyone direct me to a source of a drawing of a B&O M-15 underframe? If not a complete drawing, can
anyone share some of the important dimensions and further information regarding the layout of the
brakes? I have the truck centers at 32' 2 3/4" (from the M-15k class diagram published in RPC #9,) but:
what is the depth of the center sill; what dimensions are the side sills (they appear to be a pressed steel Z?
About 10" in depth?,) and end sills (from photos, I'm estimating them to be a 12" rolled channel, offset 2"
upwards from the bottom of the side sills.) The crossbearers are set rather more widely than the door
posts, with the KC brake gear sitting between them with room to spare, although a brake lever bracket
mounted under the side sill suggests an atypical rigging. Rivets on the side sills also indicate three
crossties in all. Any help provided is much appreciated. Thank you,