--- In [email protected], Rollain Mercier <[EMAIL PROTECTED]> wrote:
>
>
> It gets complicated - the Heavy and Light Mikados were developed
for variations in rail conditions. Axle limits precluded building the
> 'one size fits all" approach so a smaller boiler (for lighter
weight) was used on the Light Mike.
>
> The same boiler used on the Light Mike was again used on the Heavy
> Pacific but with the Heavy Mikado firebox. Only the Light Mikado
> firebox was used on the Light Pacific and a smaller boiler was
> applied. Only 20 Heavy Pacifics were built and they all went to the
> Erie. Both Erie and C&EI bought copies later with larger tenders
and Delta trailing trucks.
>
> Raleigh in chilly Maine
For anyone with serious interest in USRA locomotives, I'd recommend
the book "Uncle Sam's Locomotives" by Gene Huddleston. I do
mean "serious interest", this is not a picture book. It is a great
resource on USRA history, designs, thinking of the time and the
controversies surrounding many of the decisions.
It may be of interest in coming full circle that the dimension of the
USRA Lt. Mike were influenced by the AT&SF 3160-series and the PRR
L1s 2-8-2's. The PRR K4's of 1914 had fireboxes and boilers
identical to the L1s and those dimensions were incorporated into the
USRA design, minus of course the PRR Belpaire style. Huddleston
attributes that as a major reason the Lt. Mikes were the most
successful (in numbers produced) of the USRA designs.
Jim K.
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