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Joined: 31-01-17

Topics: 15

Replies: 21

Posted: Mon 6th Feb 2017, 11:58am

This is an interesting conversation that came up yesterday when I visited High Legh to see a Phoenix Locos Tug. How do people deal with adhesion with 0-4-0 electric locomotives. They tend to be inherently lighter than there steam counterparts. Ensuring both axles are driven would seem one option either by multiple motors, chain or belt drive or even coupling (as with the Class 08's). Another thought might be some kind of crawler gear to help get started, then switching up when running ? Apart from adding dead weight, has anyone else come up with solutions to this ?


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Joined: 1-01-94

Topics: 24

Replies: 198

Posted: Tue 7th Feb 2017, 2:39pm

The limit is traction not power so there is no need for a crawler. Add more weight

Peter Beevers

Joined: 9-10-01

Topics: 5

Replies: 166

Posted: Tue 7th Feb 2017, 10:34pm

To echo what Martin said: it's basic physics, the coefficient of friction is low for the wheel/rail interface (more so in damp conditions), so you need plenty of weight on the wheels to get the power down. There's no shortcut, no other answer.


Joined: 1-01-85

Topics: 10

Replies: 70

Posted: Wed 8th Feb 2017, 9:26am

Hi All
As Peter says, weight is the answer, try to build it in from the outset if possible, but if not then adding lead in available spaces will help. Weight does not pose any real problems except for handling of course and maybe wear on bearings if not properly lubricated.
Certainly there is no need for variable gearing in our scale, today's electronic controllers allow for torque to be delivered smoothly into the rail. I would recommend watching how a skilled steam driver manages with, say, a Tich, Bridget or similar, after all they have to start with only four power bursts per wheel revolution - it is as much about the driving as the locomotive, that's part of the fun !
Kind Regards, Ivan
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