HP 4-8-2 Mountain

HP 4-8-2 Mountain

Postby areibel » Mon Nov 23, 2009 9:45 pm

Another big HP Beast!
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Re: HP 4-8-2 Mountain

Postby Arseny » Tue Sep 06, 2011 5:10 pm

My biggest locomotive!

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Side-by-site with Tillig's BR81


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Side-by-site with BTTB's BR56
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Re: HP 4-8-2 Mountain

Postby Rob M » Sun Feb 19, 2012 5:14 pm

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Re: HP 4-8-2 Mountain

Postby Arseny » Sun Feb 19, 2012 5:39 pm

Rob, very nice!

What radius do you use for curves? My Mountain can not take standart 310-mm radius... :cry:
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Re: HP 4-8-2 Mountain

Postby Rob M » Sun Feb 19, 2012 6:11 pm

Sorry, I don't know what radius these need. The HP catalog suggests a 16" (406mm) conventional curve radius.
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Re: HP 4-8-2 Mountain

Postby Rob M » Mon Feb 20, 2012 6:21 pm

Looks like HP recommends a 15" (381mm) radius for the mountain.
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Last edited by Rob M on Wed May 02, 2018 4:56 pm, edited 1 time in total.
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Re: HP 4-8-2 Mountain

Postby Arseny » Tue Feb 21, 2012 6:51 am

Yes, I noticed! Thank you!
Tillig offers 396-mm curves... so I need a lot of space!
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Re: HP 4-8-2 Mountain

Postby CaTTwoman281 » Fri Jun 22, 2012 4:54 pm

For those that are curious, the differences between the HP 4-8-2 and the HP 2-8-2 are more than just having a 4 wheeled versus a 2 wheeled leading wheel set.

The firebox and frame are of different lengths as well. The boiler portion itself is roughly the same between the two.

Both engines are lined up at the juncture between the firebox and boiler:
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Re: HP 4-8-2 Mountain

Postby AstroGoat760 » Wed Aug 22, 2012 4:33 pm

Here are some pictures showing the differences between the HP 4-8-2 with spoke drivers, and with Box-Pok drivers:

1.) Side elevation, showing the driver differences.
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2.) Top view. The only difference from this angle is the location of the whistle.
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3.) Front view, showing the difference between the stamped pilot (left) and cast pilot (right).
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Here is a quick test-conversion from a Mountain to a Northern, by swapping out the 2 wheel trailing truck with the 4 wheel trailing truck from my HP Challenger. This does reduce the minimum operating radius for the engine, due to the difference in distance from pivot point to the wheels. At low speeds I can get my HP Mountain to travel on 310mm (roughly 12in.) radius curves. With the 4 wheel trailing truck attached, the rear truck always binds and derails on the 310mm curved track.
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Course Set, Speed - Maximum Warp, PUNCH IT!
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Re: HP 4-8-2 Mountain

Postby AstroGoat760 » Fri Sep 22, 2017 2:43 pm

Arseny wrote:Rob, very nice!

What radius do you use for curves? My Mountain can not take standart 310-mm radius... :cry:

Interesting, my spoke-drivered HP Mountain runs fairly well on 310 mm radius Tillig Bedding Track.
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