Typical EMD control stand had:
1. 10 notch throttle; emergency MU shut down, idle, 1 thru 8 power
"notches"
2. transition selector lever which could have 6 positions; 1 thru 4 for
the four traction motor circuit changes (series, series-parallel, parallel,
and parallel shunt), OFF (for locking the control stand and removing the
reverser) and dynamic brake at which time the throttle became a rheostat (no
notches)
to control dynamic brake amperage. It is my understanding that only the FTs
and possibly the F2s had "manual transition"; all subsequent Fs had "automatic
transition". The engineer would have to manually "shift transition" when
operating with FTs as prescribed by the EMD operators manual; kind of like
driving an automobile with a four speed manual transmission. While the
engineer was
running the train, the fireman watched engine cooling water temperature
(ideally 165 degrees +/- 15 deg.) and would be responsible for engaging the
manual
clutches on the cooling fans of FTs; truly "hand-fired" diesels!
3. The reverser which could be removed from the control stand to "lock"
the locomotive.
4. A lot of locomotives (for example GP7s, E-7, 8, & 9s) had a
"maximum/minimum" TM field starting switch. On GP-7s, it was a toggle switch
on both
control stands whereas on the Es there was a "knife" switch in each electrical
cabinet.
GE, an early proponent of "Erector Set Technology", had 16 power notches with
3 foot long throttles on their U25/28 B & C models; kind of like a roof hung
throttle on an O-5, only mounted horizontally!
Alco - the few that I was familiar with had 8 power notches like the EMDs and
to this day I say they built a much finer locomotive than anything GE has yet
to produce. The wrong company went out of business in 1969.
Baldwin - don't know much about but believe the had "air" throttles.
I hope this answers your question(s)? I'm sure others on this list will add
more.
Bob Campbell
[Non-text portions of this message have been removed]
------------------------ Yahoo! Groups Sponsor ---------------------~-->
Make a clean sweep of pop-up ads. Yahoo! Companion Toolbar.
Now with Pop-Up Blocker. Get it for free!
http://us.click.yahoo.com/L5YrjA/eSIIAA/yQLSAA/8ZCslB/TM
---------------------------------------------------------------------~->
Yahoo! Groups Links
<*> To visit your group on the web, go to:
http://groups.yahoo.com/group/CBQ/
<*> To unsubscribe from this group, send an email to:
CBQ-unsubscribe@yahoogroups.com
<*> Your use of Yahoo! Groups is subject to:
http://docs.yahoo.com/info/terms/
|