The baffle boards run wall-to-wall inside the shell and to the
ceiling on the sides. The gap created between the top of the
(straight) plastic and the (curved) ceiling allows back pressure to
find its way out through the truck openings.
A Westside Alco PB unit was similar. However, the design didn’t
lend itself to baffling, so I created an enclosure with styrene
vertical bulkheads attached with caulk. I made sure that the
area between the bulkheads [11] was sealed on both the shell
and the floor.
There you have my most frequent methods of installing speakers
in HO‐scale diesels. For more food for thought, including exam-
ples in other scales, check out my website,
In my August column I’ll show you some quick methods for cut-
ting and fitting these baffles and enclosures.
10. Stewart FT B fuel tank opening to allow the sound out.
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