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Found this thread very intresting, i use code 100 peco track work, and have four double slips sited one behind the other, some of my locos, especially my bachman jinty, will not travel over this section of track work at slow speed with out stalling, what seems to happen is that the front r/h wheel and the rear left hand wheel hit the frogs at the same time, and the loco effectivly tips into the frog, if you touch the loco it rocks back and forth, now im just wondering if this shimming of the frog and maybe the check rail will help ease this annoying problem?
 

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QUOTE (34C @ 9 May 2008, 11:59) <{POST_SNAPBACK}>Before working on the track, check that all the pick up collectors bear properly on the wheelbacks. It's a rare RTR loco that has the pick ups as well set as they can be. If so inclined take off the keeper plate. You will see that the centre axle is on a sprung plunger; a useful feature, except that the keeper plate holds the axle rigid. If you make two semi-circular rebates in the keeper plate sides under the axle position, and a broader rectangular cut out under the plunger the axle will be free to travel downwards. Take a half millimetre off the top surface of the plunger if there is no upward travel as supplied. That should mean 5 out of 6 wheels available for current collection at all times. Many Bachmann 'blue riband' steam models have a sprung driven axle, and without exception to date all my examples have been supplied with the axle constrained to a near fixed position.

Many thanks for that information 34C, will check to see if thats the case and try to adjust acordingly,
 

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have spent the afternoon carrying out some very minor surgery on my Bachman jinty, in accordance with the information given by 34C, and after suffering rough slow running over my double slip points, im now happy to report all is well, what a difference an hours work has made to this locomotive, its a pleasure to see it trundle over a whole section of point work smoothly, something its never done since new, a big thanks to 34C
 
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