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I'm going to start this post by saying I have no MTH PS-3 locomotives and have no idea as to how they operate.

Our local Historical Society has a small O gauge display layout in their museum.  They have it set up so that kids (of all ages) can simply push a button to set the trains in motion for a given amount of time.  Everything is run conventionally.  This works well except for one locomotive.  They were given an MTH GP38 from 2015 (sorry I don't have the product number) It is on its own dedicated track.  A staff member has to power up the transformer and wait until the loco "wakes up" then cycle it to forward to get it running.  As this is a small museum, there isn't a huge amount of traffic.  The limited number of volunteers makes it difficult to have someone stationed at the layout at all times.  Of course, everyone wants to see this locomotive in action.

I'm thinking that the only way to make this engine work with the push button control is to bypass the PS-3 electronics and wire the motors directly to the track via a bridge rectifier.  As long as the headlights, ditch lights and cab strobe work I think everyone would be happy.  They can live without the electro-couplers and sound for obvious reasons.  They just want a forward running puller.

Has anybody performed a conversion like this?  Am I trying to oversimplify what needs to be done?  What say you, electrical gurus.

Tom

Last edited by Tom Densel
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You can run the PS/3 locomotive in conventional mode and lock it to start and always run in forward as soon as power is applied.  This paragraph is in almost any PS/2 or PS/3 user's guide.

Lock into a directional state:

You can lock your engine into a directional state (forward, neutral or reverse) to prevent
it from changing directions. To do this, put the engine into the direction you want or in
neutral, run it at a very low speed (<10 scale mph), and quickly but firmly press your
remote’s Whistle button once followed immediately by three presses of the Bell button.
Two whistle blasts will indicate that the engine has made the change. The engine will
not change direction (including going into neutral) until you repeat the 1 whistle, 3
bells code to return the engine to its normal state, even if the engine has been kept
without power for extended periods of time.

You can run the PS/3 locomotive in conventional mode and lock it to start and always run in forward as soon as power is applied.  This paragraph is in almost any PS/2 or PS/3 user's guide.

Lock into a directional state:

You can lock your engine into a directional state (forward, neutral or reverse) to prevent
it from changing directions. To do this, put the engine into the direction you want or in
neutral, run it at a very low speed (<10 scale mph), and quickly but firmly press your
remote’s Whistle button once followed immediately by three presses of the Bell button.
Two whistle blasts will indicate that the engine has made the change. The engine will
not change direction (including going into neutral) until you repeat the 1 whistle, 3
bells code to return the engine to its normal state, even if the engine has been kept
without power for extended periods of time.

Thanks John!

Can this be done with a Z-4000 transformer?  I don't have a DCS remote nor do I know anybody that has one locally.

Tom

@Tom Densel posted:

...

Can this be done with a Z-4000 transformer?  ...

Yes.

W and B button timing can be tricky if this is first time you've tried a W-B combo sequence.

Above video shows the W-B-B-B-B-B sequence (to completely reset engine) on a Z-4000.  To lock your engine in the FWD direction you only need W-B-B-B while the engine is slowly moving in the FWD direction.

As long as your engine's battery is properly charged, when you power down the engine...the locked-in-FWD condition will be remembered the next time you power up the engine.

Thanks guys!  I did the W-B-B-B sequence and it now starts in forward. 

Like I said in my original post, I have no MTH locomotives nor any DCS equipment.  I have no manuals or paperwork.  I was just handed this locomotive and asked to see if I could find an electrical short. (Found a bare wire) I was also asked if there was any way to make it start in forward without jumping through a bunch of hoops.  Without access to the manuals I did the next best thing and posted here on the Forum.  You guys are better than a manual, anyway!

Tom

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