I have a MTH GP9 Ps1 that I converted to TMCC that needs a shorter pick up arm on the truck to negotiate through my fastrack switches. My suggestions as to a MTH part number to replace the long pick up arm rollers? My email is listed on the form.
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Why does it require a shorter arm?
Spacing of pick up arms are to close using long arms for going over fastrack switch and kill power to engine.
Do you know whether MTH eventually changed to a shorter arm, for example, on later production of the same loco? If not, you're talking about something custom that requires original engineering. You'll need help from a creative MTH tech who has a good working knowledge of various locos, to recommend an arm that will work.
Your other option is to replace the whole drive block, perhaps with one from an F-unit. (Obviously the pilots are different; not sure if the drive block and pickups are the same.)
Your best bet might be to bring the loco to a large train show like York, and compare to other MTH locos that are out of the box and on the tables. Once you spy a setup that will work, you can make note of the loco number, and order the correct part.
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